Cyanotech (CYAN) 10-K 22 Jun 21 2021 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Mar. 31, 2021	Jun. 15, 2021	Sep. 30, 2020
Document Information [Line Items]
Entity Registrant Name	Cyanotech Corp
Entity Central Index Key	0000768408
Trading Symbol	cyan
Current Fiscal Year End Date	--03-31
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding (in shares)		6,117,719
Entity Public Float			$ 6,941,967
Entity Shell Company	false
Document Type	10-K
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Title of 12(b) Security	Common Stock, $0.02 par value per share

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Mar. 31, 2021	Mar. 31, 2020
Current assets:
Cash	$ 3,767,000	$ 2,417,000
Accounts receivable, net of allowance for doubtful accounts of $32 in 2021 and $13 in 2020	2,436,000	2,154,000
Inventories, net	8,415,000	9,653,000
Prepaid expenses and other current assets	488,000	504,000
Total current assets	15,106,000	14,728,000
Equipment and leasehold improvements, net	12,136,000	13,042,000
Operating lease right-of-use assets, net	3,517,000	3,834,000
Other assets	120,000	183,000
Total assets	30,879,000	31,787,000
Current liabilities:
Accounts payable	2,287,000	2,137,000
Accrued expenses	844,000	849,000
Customer deposits	124,000	327,000
Operating lease obligations, current portion	343,000	319,000
Short-term contract obligation		38,000
Line of credit	1,000,000	2,000,000
Current maturities of long-term debt	1,210,000	689,000
Total current liabilities	5,808,000	6,359,000
Long-term debt, less current maturities	4,823,000	6,009,000
Long-term operating lease obligations	3,175,000	3,519,000
Other long-term liabilities	32,000	54,000
Total liabilities	13,838,000	15,941,000
Commitments and contingencies
Stockholders’ equity:
Preferred stock of $0.01 par value, authorized 10,000,000 shares; no shares issued and outstanding
Common stock of $0.02 par value, authorized 50,000,000 shares; issued and outstanding 6,116,073 shares at March 31, 2021 and 6,011,885 shares at March 31, 2020	122,000	120,000
Additional paid-in capital	33,267,000	32,994,000
Accumulated deficit	(16,348,000)	(17,268,000)
Total stockholders’ equity	17,041,000	15,846,000
Total liabilities and stockholders’ equity	$ 30,879,000	$ 31,787,000

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Accounts receivable, allowance for doubtful accounts	$ 32	$ 13
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred, authorized shares (in shares)	10,000,000	10,000,000
Preferred, issued shares (in shares)	0	0
Preferred outstanding, shares (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.02	$ 0.02
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	6,116,073	6,011,885
Common stock, shares outstanding (in shares)	6,116,073	6,011,885

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Net sales	$ 32,345	$ 31,899	$ 30,202
Cost of sales	21,228	19,199	19,736
Gross profit	11,117	12,700	10,466
Operating expenses:
General and administrative	4,876	5,281	5,718
Sales and marketing	5,518	5,758	6,822
Research and development	639	608	923
Total operating expense	11,033	11,647	13,463
Income (loss) from operations	84	1,053	(2,997)
Other income (expense):
Interest expense, net	(550)	(657)	(582)
Gain on extinguishment of debt	1,389
Total other income (expense), net	839	(657)	(582)
Income (loss) before income taxes	923	396	(3,579)
Income tax expense	(3)	(9)	(17)
Net income (loss)	$ 920	$ 387	$ (3,596)
Net income (loss) per share:
Basic (in dollars per share)	$ 0.15	$ 0.06	$ (0.62)
Diluted (in dollars per share)	$ 0.15	$ 0.06	$ (0.62)
Shares used in calculation of net income (loss) per share:
Basic (in shares)	6,070	5,956	5,819
Diluted (in shares)	6,200	5,961	5,819

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Former Executive [Member]Common Stock [Member]	Former Executive [Member]Additional Paid-in Capital [Member]	Former Executive [Member]Retained Earnings [Member]	Former Executive [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Mar. 31, 2018					5,772,032
Balance at Mar. 31, 2018					$ 115	$ 32,051	$ (14,059)	$ 18,107
Issuances of common stock for Director Stock Grants (in shares)					47,223
Issuances of common stock for Director Stock Grants					$ 1	169		$ 170
Issuance of common stock for exercise of stock options for cash (in shares)					49,600			49,600
Issuance of common stock for exercise of stock options for cash					$ 1	107		$ 108
Issuances of vested shares of restricted stock (in shares)					16,003
Issuances of vested shares of restricted stock						(32)		(32)
Shares withheld for tax payments (in shares)					(5,148)
Shares withheld for tax payments
Share-based compensation expense						152		152
Net income (loss)							(3,596)	(3,596)
Shares withheld for tax payments
Balance (in shares) at Mar. 31, 2019					5,879,710
Balance at Mar. 31, 2019					$ 117	32,447	(17,655)	14,909
Issuances of common stock for Director Stock Grants (in shares)					74,882
Issuances of common stock for Director Stock Grants					$ 1	157		$ 158
Issuance of common stock for exercise of stock options for cash (in shares)					2,112			2,112
Issuance of common stock for exercise of stock options for cash						4		$ 4
Issuances of vested shares of restricted stock (in shares)					22,489
Issuances of vested shares of restricted stock					$ 1	(32)		(31)
Shares withheld for tax payments (in shares)	(18,629)				(7,672)
Shares withheld for tax payments
Share-based compensation expense						99		99
Net income (loss)							387	387
Issuance of common stock in connection with severance of former executive (in shares)					58,993
Issuance of common stock in connection with severance of former executive					$ 1	319		320
Shares withheld for tax payments
Issuance of common stock in connection with severance of former executive					$ (1)	(319)		(320)
Balance (in shares) at Mar. 31, 2020					6,011,885
Balance at Mar. 31, 2020					$ 120	32,994	(17,268)	15,846
Issuances of common stock for Director Stock Grants (in shares)					66,385
Issuances of common stock for Director Stock Grants					$ 1	157		$ 158
Issuance of common stock for exercise of stock options for cash (in shares)					19,000			19,000
Issuance of common stock for exercise of stock options for cash						68		$ 68
Issuances of vested shares of restricted stock (in shares)					17,469
Issuances of vested shares of restricted stock					$ 1	(8)		(7)
Shares withheld for tax payments (in shares)	(3,635)				(6,431)
Shares withheld for tax payments
Share-based compensation expense						56		56
Net income (loss)							920	920
Issuance of common stock in connection with severance of former executive (in shares)					11,400
Issuance of common stock in connection with severance of former executive
Shares withheld for tax payments
Issuance of common stock in connection with severance of former executive
Balance (in shares) at Mar. 31, 2021					6,116,073
Balance at Mar. 31, 2021					$ 122	$ 33,267	$ (16,348)	$ 17,041

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 920,000	$ 387,000	$ (3,596,000)
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
Depreciation and amortization	1,748,000	1,934,000	1,908,000
Gain from extinguishment of debt – PPP loan	(1,389,000)
Loss on impairment of assets	64,000	0
Amortization of debt issue costs and other assets	90,000	80,000	71,000
Amortization of operating leases right-of-use assets	317,000	294,000
Share-based compensation expense	214,000	577,000	322,000
Provision for doubtful accounts	46,000
Net (increase) decrease in assets:
Accounts receivable	(328,000)	(172,000)	682,000
Inventories	1,238,000	1,621,000	(2,240,000)
Prepaid expenses and other assets	18,000	41,000	64,000
Net increase (decrease) in liabilities:
Accounts payable	4,000	(2,785,000)	1,395,000
Accrued expenses	3,000	(143,000)	100,000
Customer deposits	(203,000)	(299,000)	493,000
Operating lease obligations	(320,000)	(289,000)
Deferred rent and other liabilities	(22,000)	(3,000)	(46,000)
Net cash provided by (used in) operating activities	2,400,000	1,243,000	(847,000)
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in equipment and leasehold improvements	(760,000)	(224,000)	(431,000)
Cash paid to acquire Cellana assets			(100,000)
Net cash used in investing activities	(760,000)	(224,000)	(531,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments on short-term contract obligation	(38,000)	(247,000)	(110,000)
Net (payments) draws on line of credit	(1,000,000)		1,500,000
Net draws on long-term debt – related party		1,500,000
Proceeds from long-term debt – PPP loan	1,381,000
Principal payments on long-term debt	(670,000)	(611,000)	(576,000)
Payments on finance leases	(24,000)	(57,000)	(66,000)
Taxes paid related to net share settlement of restricted stock units	(7,000)	(31,000)	(32,000)
Proceeds from issuance of common stock and exercise of stock options	68,000	4,000	108,000
Net cash (used in) provided by financing activities	(290,000)	558,000	824,000
Net increase (decrease) in cash	1,350,000	1,577,000	(554,000)
Cash at beginning of year	2,417,000	840,000	1,394,000
Cash at end of year	3,767,000	2,417,000	840,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest	446,000	618,000	380,000
Income taxes	14,000
Non-cash financing activities:
Purchase of Cellana assets			495,000
Less: Issuance of short-term obligation			(395,000)
Cash paid to acquire Cellana assets			$ 100,000

Note 1 - Organization and Basis

Note 1 - Organization and Basis of Presentation	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Business Description and Basis of Presentation [Text Block]	1. ORGANIZATION AND BASIS OF PRESENTATION Cyanotech Corporation (the “Company”), located in Kailua-Kona, Hawaii, was incorporated in the state of Nevada on March 3, 1983 The Company is an agricultural company that produces high value natural products derived from microalgae grown in complex and intricate open-pond agricultural systems on the Kona coast of Hawaii. The Company's products include Hawaiian Spirulina Pacifica BioAstin Hawaiian Astaxanthin The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America. The accompanying consolidated financial statements include the accounts of Cyanotech Corporation and its wholly owned subsidiary, Nutrex Hawaii, Inc. (“Nutrex Hawaii” or “Nutrex”). Intercompany balances and transactions have been eliminated in consolidation. Liquidity and Capital Resources As of March 31, 2021, $3,767,000 $9,298,000 $2,417,000 $8,369,000, March 31, 2020. $2,000,000 March 31, 2021 2020, $1,000,000 $2,000,000, August 30, 2021, As of March 31, 2021, $4,613,000 August 2032. March 31, 2021 2020, In response to the coronavirus (“COVID- 19” May 2020, $1,381,000, 2020. December 2020, 6 April 2019, $1,500,000 April 12, 2021, 6 16 Funds generated by operating activities and available cash are expected to continue to be the Company's most significant sources of liquidity for working capital requirements, debt service and funding of maintenance levels of capital expenditures. In fiscal year 2020, 2021. Based upon the Company's operating plan and related cash flow and financial projections, cash flows expected to be generated by operating activities and available financing are expected to be sufficient to fund the Company's operations through at least June 30, 2022, March 31, 2022, no March 31, 2022.

Note 2 - Significant Accounting

Note 2 - Significant Accounting Policies	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Significant Accounting Policies [Text Block]	2. SIGNIFICANT ACCOUNTING POLICIES Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosures of any contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the periods reported. Management reviews these estimates and assumptions periodically and reflects the effect of revisions in the period that they are determined to be necessary. Actual results could differ from those estimates and assumptions. Financial Instruments The Company applies a framework for measuring fair value. That framework provides a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (level 1 3 three Level 1 Inputs to the valuation methodology are unadjusted quoted prices for identical assets or liabilities in active markets that the Company has the ability to access. Level 2 Inputs to the valuation methodology include: ● Quoted prices for similar assets or liabilities in active markets; ● Quoted prices for identical or similar assets or liabilities in inactive markets; ● Inputs other than quoted prices that are observable for the asset or liability; and ● Inputs that are derived principally from or corroborated by observable market data by correlation or other means. If the asset or liability has a specified (contractual) term, the Level 2 Level 3 Inputs to the valuation methodology are unobservable and significant to the fair value. Cash, Accounts Receivable, Accounts Payable, Accrued Expenses and Customer Deposits Line of Credit, Short-Term Contract Obligations and Long-Term Debt Cash Cash primarily consists of cash on hand and cash in bank deposits. Concentration Risk The Company maintains its cash accounts in banks located in Hawaii, which are insured by the Federal Deposit Insurance Corporation (“FDIC”) up to $250,000 March 31, 2021 2020 $3,267,000 $1,917,000, March 31, 2021, two 19% 17% March 31, 2020, two 33% 18% March 31, 2019, two 33% 24% two 57% 80%, March 31, 2021 2020, Accounts Receivable Accounts receivable are recorded at the invoiced amount and do not not 90 not Inventories Inventories are stated at the lower of cost or net realizable value. Cost is determined using the first first third may The Company recognizes abnormal production costs, including fixed cost variances from normal production capacity, fixed production overhead costs, idle facilities, freight handling costs and spoilage, as an expense in the period incurred, without adjusting overhead absorption rates. Normal production capacity is defined as the production expected to be achieved over a number of periods or seasons under normal circumstances, taking into account the loss of capacity resulting from planned maintenance. Equipment and Leasehold Improvements Equipment and leasehold improvements are stated at cost. Depreciation and amortization are provided using the straight-line method over the estimated useful lives for equipment and furniture and fixtures, and the shorter of the land lease term (see Notes 4 8 Equipment 3 to 10 Furniture and fixtures 3 to 7 Leasehold improvements 10 to 25 Capital project costs are accumulated in construction-in-progress until completed, at which time the costs are transferred to the relevant asset and commence depreciation. Repairs and Maintenance costs are expensed in the period incurred. Repairs and maintenance that significantly increase the useful life or value of the asset are capitalized and depreciated over the remaining life of the asset. The Company capitalizes interest cost incurred on funds used to construct property and equipment. The capitalized interest is recorded as part of the asset to which it relates and is amortized over the asset's estimated useful life. Impairment of Long-Lived Assets Management reviews long-lived assets, such as equipment, leasehold improvements and purchased intangibles subject to amortization for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not not Accounting for Asset Retirement Obligations Management evaluates quarterly the potential liability for asset retirement obligations under the Company's lease for its principal facility and corporate headquarters. No March 31, 2021 2020 8 Revenue Recognition The Company records revenue based on the five 1 2 3 4 5 may not Revenue is measured as the net amount of consideration expected to be received in exchange for fulfilling a performance obligation. The Company has elected to exclude sales, use and similar taxes from the measurement of the transaction price. The amount of consideration expected to be received and revenue recognized includes estimates of variable consideration, which includes costs for trade promotion programs, coupons, returns and early payment discounts. Such estimates are calculated using historical averages adjusted for any expected changes due to current business conditions and experience. The Company reviews and updates these estimates at the end of each reporting period and the impact of any adjustments are recognized in the period the adjustments are identified. In assessing whether collection of consideration from a customer is probable, the Company considers the customer's ability and intent to pay that amount of consideration when it is due. Payment of invoices is due as specified in the underlying customer agreement, typically 30 one Customer contract liabilities consist of customer deposits received in advance of fulfilling an order and are shown separately on the consolidated balance sheets. During the years ended March 31, 2021 2020, $251,000 $550,000, March 31, 2020 2019, one not Research and Development Research and development costs are expensed as incurred and consist primarily of labor, benefits and outside research. Advertising Advertising costs are expensed as incurred. Total advertising expense for the years ended March 31, 2021, 2020 2019 $2,116,000, $1,992,000, $2,413,000, Income Taxes Income taxes are accounted for under the asset and liability method. The asset and liability method require the recognition of deferred tax assets and liabilities for the expected future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their tax bases and operating loss and tax credit carry forwards. Deferred tax assets and liabilities are measured using income tax rates applicable to the period in which the tax difference is expected to reverse. Judgment is required in determining any valuation allowance recorded against deferred tax assets, specifically net operating loss carryforwards, tax credit carryforwards and deductible temporary differences that may In evaluating a tax position for recognition, management evaluates whether it is more-likely-than- not not 50% March 31, 2021 2020, no The Company recognizes accrued interest related to unrecognized tax benefits as well as any related penalties in interest expense in its consolidated statements of operations. During the years ended March 31, 2021 2020, no Share-Based Compensation The Company accounts for share-based payment arrangements using fair value. The Company currently has no not The Company utilizes the Black-Scholes option pricing model to determine the fair value of each option award. Expected volatilities are based on the historical volatility of the Company's common stock over a period consistent with that of the expected term of the options. The expected term of the options is estimated based on factors such as vesting periods, contractual expiration dates and historical exercise behavior. The risk-free rates for periods within the contractual life of the options are based on the yields of U.S. Treasury instruments with terms comparable to the estimated option terms. The forfeiture rate of the options is based on historical forfeitures of similar grants. Per Share Amounts Basic earnings (loss) per common share is calculated by dividing net income (loss) for the year by the weighted average number of common shares outstanding during the year. Diluted earnings per common share is calculated by dividing net income for the year by the sum of the weighted average number of common shares outstanding during the year plus the number of potentially dilutive common shares (“dilutive securities”) that were outstanding during the year. Dilutive securities include restricted stock units and stock options granted pursuant to the Company's stock option plans. Dilutive securities related to the Company's stock option plans are included in the calculation of diluted earnings per common share using the treasury stock method. Potentially dilutive securities are excluded from the computation of earnings per share in periods in which a net loss is reported, as their effect would be antidilutive. A reconciliation of the numerators and denominators of the basic and diluted income (loss) per common share calculations for the years ended March 31, 2021, 2020 2019 12. Recently Adopted Accounting Pronouncements Effective April 1, 2019, 2016 02, Leases (Topic 842 No. 2018 01, 2018 10, 2018 11, 2018 20 2019 01 No. 2016 02, 842” 842 not 842 not 6. 8 In June 2018, 2018 07, Compensation - Stock Compensation (Topic 718 ) No. 2018 07” No. 2018 07 718 No. 2018 07 first 2020. No. 2018 07 April 1, 2019 no In November 2018, 2018 18 Collaborative Arrangements 2018 18” not 606, April 1, 2018, 2018 18 April 1, 2020 no In August 2018, 2018 15, Customer s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract No. 2018 15” (Subtopic 350 - 40 ) No. 2018 15 April 1, 2020 no In August 2018, 2018 13, Fair Value Measurement - Disclosure Framework (Topic 820 ) No. 2018 13” April 1, 2020, no Recently Issued Accounting Pronouncements In December 2019, 2019 12, Simplifying the Accounting for Income Taxes 2019 12” 2019 12 December 15, 2020, may

Note 3 - Inventories

Note 3 - Inventories	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Inventory Disclosure [Text Block]	3. INVENTORIES Inventories consist of the following as of March 31, 2021 2020: 2021 2020 (in thousands) Raw materials $ 547 $ 397 Work in process 3,206 4,172 Finished goods 4,423 4,945 Supplies 239 139 Inventories, net $ 8,415 $ 9,653 The Company recognizes abnormal production costs, including fixed cost variances from normal production capacity, fixed production overhead costs, idle facilities, freight handling costs and spoilage, as an expense in the period incurred, without adjusting overhead absorption rates. Normal production capacity is defined as the production expected to be achieved over a number of periods or seasons under normal circumstances, taking into account the loss of capacity resulting from planned maintenance. The Company expensed abnormal production costs of $110,000, $0 $250,000 March 31, 2021, 2020 2019, In fiscal 2021, first six not Other non-inventoriable fixed costs of $179,000, $343,000 $176,000 March 31, 2021, 2020 2019,

Note 4 - Equipment and Leasehol

Note 4 - Equipment and Leasehold Improvements	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	4. EQUIPMENT AND LEASEHOLD IMPROVEMENTS Equipment and leasehold improvements consist of the following as of March 31, 2021 2020: 2021 2020 (in thousands) Equipment $ 19,056 $ 18,841 Leasehold improvements 14,703 14,736 Furniture and fixtures 372 369 34,131 33,946 Less accumulated depreciation and amortization (22,740 ) (21,179 ) Construction in-progress 745 275 Equipment and leasehold improvements, net $ 12,136 $ 13,042 Management has determined that $64,000 March 31, 2021, No March 31, 2020. Depreciation and amortization expense were approximately $1,748,000, $1,934,000 $1,908,000 March 31, 2021, 2020 2019,

Note 5 - Short-term Contract Ob

Note 5 - Short-term Contract Obligation	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Short-term Debt [Text Block]	5. SHORT-TERM CONTRACT OBLIGATION On November 30, 2018, six August 31, 2018. third $495,000 $100,000 $395,000 The short-term obligation was comprised of two $180,000 $215,000. first $180,000 6.25% four December 1, 2018 July 15, 2019. no March 31, 2021 March 31, 2020. The second $215,000 twelve December 1, 2018 October 15, 2019. $38,000 March 31, 2021 March 31, 2020 $0 $38,000,

Note 6 - Line of Credit and Lon

Note 6 - Line of Credit and Long-term Debt	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Debt Disclosure [Text Block]	6. LINE OF CREDIT AND LONG-TERM DEBT Total debt consists of the following at March 31, 2021 2020 2021 2020 (in thousands) Line of credit $ 1,000 $ 2,000 Long-term debt 4,673 5,367 Long-term debt – related party 1,500 1,500 Less current maturities (2,210 ) (2,689 ) Long-term debt, excluding current maturities 4,963 6,178 Less unamortized debt issuance costs (140 ) (169 ) Total long-term debt, net of current maturities and unamortized debt issuance costs $ 4,823 $ 6,009 Line of Credit and Term Loans On August 30, 2016, June 3, 2016, $2,000,000 3.25% March 31, 2021 4.75% March 31, 2020) 2%, no 5.25%. At March 31, 2021 2020, $1,000,000 $2,000,000, August 30, 2020 August 30, 2021. August 30, 2018 1.50:1 The Credit Agreement grants the Bank the following security interests in the Company's property: (a) a lien on the Company's leasehold interest in its Kona facility; (b) an assignment of the Company's interest in leases and rents on its Kona facility; and (c) a security interest in all fixtures, furnishings and equipment related to or used by the Company at the Kona facility. Each security interest is further subject to the terms of the Credit Agreement. In 2015, $2,500,000 “2015 July 30, 2015 “2015 2015 $2,500,000, 2015 $500,000 September 18, 2015, The provisions of the 2015 September 1, 2022, seven 7 2015 3.25% 4.75% March 31, 2021 2020, 2.0% first no 6.0%. 2015 5.0% first 2015 1.0% fifth no 2015 $635,000 $1,027,000 March 31, 2021 2020, In 2012, $5,500,000 “2012 August 14, 2012 “2012 2012 $2,250,000 $3,250,000, 2012 The provisions of the 2012 first 12 August 14, 2032, nineteen 19 2012 3.25% 4.75% March 31, 2021 March 31, 2020, 1.0% first no 5.5%. 2012 $3,978,000 $4,222,000 March 31, 2021 2020, The 2015 one $113,900 0.5% December 31 December 31, 2015. 80% 2015 2012 one $214,500 0.25% December 31 December 31, 2012. 80% 2012 $140,000 $169,000 March 31, 2021 2020, Loan Covenants The Company's Credit Agreement, 2015 2012 March 31, 2021 2020, Long-term Debt PPP In May 2020, $1,381,000 May 2022. December 2020, 2021, $1,381,000 $8,000 $1,389,000, Long-term Debt Related Party In April 2019, $1,500,000, 1%, 4.25% 5.5% March 31, 2021 2020, April 2021 ( 16 March 31, 2021, $1,500,000 $500,000 $1,000,000 March 31, 2020, $1,500,000 Equipment Finance Agreement In October 2017, $175,000 4.75%. October 31, 2022. $60,000 $94,000 March 31, 2021 2020, Finance Lease Obligations In February 2016, $51,000 March 2021 60 4.18%. $0 $11,000 March 31, 2021 2020, In July 2015, $174,000 July 2020 60 6.57%. $0 $13,000 March 31, 2021 2020, For fiscal years ended March 31, 2021 2020, $15,000 $25,000, Future principal payments under the loans and equipment finance agreement at March 31, 2021 Fiscal year ending March 31 (in thousands) 2022 $ 1,210 2023 515 2024 1,287 2025 304 2026 321 Thereafter 2,536 Total principal payments $ 6,173

Note 7 - Accrued Expenses

Note 7 - Accrued Expenses	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Accounts Payable and Accrued Liabilities Disclosure [Text Block]	7. ACCRUED EXPENSES Accrued expenses as of March 31, 2021 2020 2021 2020 (in thousands) Wages, commissions, bonus and profit sharing $ 211 $ 295 Vacation 408 301 Rent, interest and legal 86 76 Other accrued expenses 139 177 Total accrued expenses $ 844 $ 849

Note 8 - Operating Leases

Note 8 - Operating Leases	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Leases of Lessee Disclosure [Text Block]	8. OPERATING LEASES The Company's principal facility and its corporate headquarters are located at the Natural Energy Laboratory of Hawaii Authority (“NELHA”) at Keahole Point in Kailua-Kona, Hawaii. The Company leases two 40 2035 19 2037. not not The Company leases facilities, equipment and land under non-cancelable operating leases expiring through 2037. five March 31, 2021, 2020 2019 $50,000, $49,000 $54,000, Right-of-use assets represent the right to use an underlying asset for the lease term and lease liabilities represent the obligation to make lease payments arising from the lease. Right-of-use assets and liabilities were recognized at April 1, 2019 March 31, 2021, 13.5 $591,000. no 2021. March 31, 2020, 13.9 7.5% $592,000. Supplemental balance sheet information related to leases consist of the following as of: Operating leases Balance Sheet Classification March 31, 2021 March 31, (in thousands) Right-of-use assets Operating lease right-of-use assets $ 4,128 $ 4,128 Accumulated lease amortization Operating lease right-of-use assets (611 ) (294 ) Total right-of-use assets $ 3,517 $ 3,834 Current lease liabilities Operating lease obligations $ 343 $ 319 Non-current lease liabilities Long-term operating lease obligations 3,175 3,519 Total lease liabilities $ 3,518 $ 3,838 Maturities of lease liabilities at March 31, 2021 Year ending March 31 (in thousands) 2022 $ 593 2023 537 2024 371 2025 371 2026 339 Thereafter 3,353 Total undiscounted lease payments 5,564 Less: present value discount (2,046 ) Total lease liabilities balance $ 3,518 Rent expense, including contingent rent, under operating leases were $616,000, $623,000 $588,000 March 31, 2021, 2020 2019, $28,000, $28,000 $29,000 March 31, 2021, 2020 2019, As of February 11, 2021, two April 19, 2021, two two 84 $8,400, not

Note 9 - Other Commitments and

Note 9 - Other Commitments and Contingencies	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	9. OTHER COMMITMENTS AND CONTINGENCIES From time to time, the Company may no March 31, 2021. As of March 31, 2021, 2020 2019, $1,005,000, $825,000 $951,000, ten April 2026 not

Note 10 - Share-based Compensat

Note 10 - Share-based Compensation	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Share-based Payment Arrangement [Text Block]	10. SHARE-BASED COMPENSATION As of March 31, 2020, two 2016 “2016 2014 “2014 March 31, 2020, two 2005 “2005 2004 “2004 No 2005 2004 On August 25, 2016, 2016 2005 2016 1,300,000 600,000 March 31, 2021, 1,078,858 2016 On August 28, 2014, 2014 2014 350,000 March 31, 2021, 43,133 2014 The following table presents shares authorized, available for future grant and outstanding under each of the Company's plans: As of March 31, 2021 Authorized Available Outstanding 2016 Plan 1,300,000 1,078,858 163,188 2014 Directors Plan 350,000 43,133 12,000 2005 Plan — — 215,300 2004 Directors Plan — — 12,000 Total 1,650,000 1,121,991 402,488 Stock Options All stock option grants made under the equity-based compensation plans were issued at exercise prices no 2016 2005 2014 No ten 10 $29,000, $133,000 $77,000 March 31, 2021, 2020 2019, 2020, $109,000 A summary of option activity under the Company's stock plans for the years ended March 31, 2021, 2020 2019 Option Activity Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value Outstanding at March 31, 2018 589,400 $ 4.06 4.9 $ 675,300 Granted 50,000 3.00 Exercised (49,600 ) 2.17 Expired (50,000 ) 4.82 Outstanding at March 31, 2019 539,800 $ 4.06 4.9 $ 675,300 Granted 5,000 2.11 Exercised (2,112 ) 2.08 Forfeited (104,388 ) 4.58 Expired (120,000 ) 3.53 Outstanding at March 31, 2020 318,300 $ 4.08 3.0 $ — Granted 130,000 2.35 Exercised (19,000 ) 3.59 Forfeited (55,000 ) 3.13 Outstanding at March 31, 2021 374,300 $ 3.64 3.9 $ 129,700 Exercisable at March 31, 2021 249,300 $ 4.29 1.2 $ 10,450 The aggregate intrinsic value in the table above is before applicable income taxes and represents the excess amount over the exercise price optionees would have received if all options had been exercised on the last business day of the period indicated, based on the Company's closing stock price of $3.30, $2.06 $3.24 March 31, 2021, 2020 2019, 2020, 2019 2018 $6,000, $1,000 $77,000, A summary of the Company's non-vested options for the year ended March 31, 2021 Nonvested Options Shares Weighted Average Grant-Date Fair Value Nonvested at March 31, 2020 37,500 $ 1.52 Granted 130,000 1.20 Vested (5,000 ) 1.27 Forfeited (37,500 ) 1.52 Nonvested at March 31, 2021 125,000 $ 1.19 The weighted average grant-date fair value of stock options granted during fiscal years 2021, 2020 2019 $155,000, $5,000 $76,000, 2021, 2020 2019 $6,000, $169,000 $72,000, The following table summarizes the weighted average characteristics of outstanding stock options as of March 31, 20 21: Outstanding Options Exercisable Options Range of Exercise Prices Number of Shares Remaining Life (Years) Weighted Average Exercise Price Number of Shares Weighted Average Exercise Price $2.11 - $2.34 105,000 9.2 $ 2.28 5,000 $ 2.11 $2.35 - $3.70 47,600 6.1 $ 2.93 22,600 $ 3.32 $3.71 - $3.95 145,200 0.4 $ 3.82 145,200 $ 3.82 $3.96 - $5.91 76,500 1.9 $ 5.62 76,500 $ 5.62 Total stock options 374,300 3.9 $ 3.64 249,300 $ 4.29 The range of fair value assumptions related to options granted during the years ended March 31, 2021, 2020 2019 2021 2020 2019 Exercise Price $ 1.20 $ 1.10 $ 3.00 Volatility 54.44 % 50.61 % 49.94 % Risk Free Rate 0.40 % 1.47 % 2.40 % Vesting Period (in years) 3.0 0 4.0 Forfeiture Rate 0 % 0 % 0 % Expected Life (in years) 6.2 6.9 6.3 Dividend Rate 0 % 0 % 0 % Total unrecognized stock-based compensation expense related to all unvested stock options was $122,000 $52,000, March 31, 2021 2020, 3.1 2.8 On May 20, 2021, 50,000 one $2.96, three Restricted Stock Grants of fully vested restricted stock issued during fiscal years 2021, 2020 2019 66,385, 78,882 47,223 2014 $158,000, $158,000 $170,000 March 31, 2021, 2020 2019, Restricted Stock Units ( RSUs ) RSUs are service-based awards granted to eligible employees under our 2016 2016 $28,000, $81,000 $75,000 March 31, 2021, 2020 2019, 2020, $6,000 The following table summarizes information related to awarded RSUs: Nonvested Restricted Stock Units Shares Weighted Average Grant Price Nonvested restricted stock units at March 31, 2018 39,675 $ 3.89 Granted 23,923 $ 4.10 Vested (16,003 ) $ 3.88 Forfeited (8,781 ) $ 4.07 Nonvested restricted stock units at March 31, 2019 38,814 $ 3.98 Granted 4,051 $ 2.67 Vested (24,483 ) $ 3.76 Forfeited (5,616 ) $ 4.01 Nonvested restricted stock units at March 31, 2020 12,766 $ 3.98 Granted 28,647 $ 2.15 Vested (9,135 ) $ 3.97 Forfeited (4,090 ) $ 2.21 Nonvested restricted stock units at March 31, 2021 28,188 $ 2.38 Total unrecognized stock-based compensation expense related to unvested restricted stock units was $42,000 $18,000 March 31, 2021 2020, 2.1 1.3 On April 6, 2021, 1,072 $3.36 two Common Stock In fiscal 2020, $205,000

Note 11 - Common and Preferred

Note 11 - Common and Preferred Stock	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	11. COMMON AND PREFERRED STOCK The Company has authorized a total of sixty million fifty million ten million None March 31, 2021 2020.

Note 12 - Earnings (Loss) Per S

Note 12 - Earnings (Loss) Per Share	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Earnings Per Share [Text Block]	12. EARNINGS (LOSS) PER SHARE Basic earnings (loss) per share is computed on the basis of the weighted average number of common shares outstanding. Diluted earnings per share is computed on the basis of the weighted average number of common shares outstanding plus the potentially dilutive effect of outstanding stock options using the treasury stock method. Reconciliations between the numerator and the denominator of the basic and diluted income (loss) per share computations for the years ended March 31, 2021, 2020 2019 Net Income (loss) (Numerator) Shares (Denominator) Per Share Amount (in thousands, except per share amounts) Year ended March 31, 2021: Basic income per share $ 920 6,070 $ 0.15 Effective dilutive securities—Common stock options — 130 — Diluted income per share $ 920 6,200 $ 0.15 Year ended March 31, 2020: Basic income per share $ 387 5,956 $ 0.06 Effective dilutive securities—Common stock options — 5 — Diluted income per share $ 387 5,961 $ 0.06 Year ended March 31, 2019: Basic and diluted loss per share $ (3,596 ) 5,819 $ (0.62 ) Basic and diluted per share amounts are the same in periods of a net loss, because common share equivalents are anti-dilutive when a net loss is recorded. Diluted earnings per share does not 50,000 March 31, 2019, not 28,188, 12,766 38,814 March 31, 2021, 2020 2019,

Note 13 - Profit Sharing and 40

Note 13 - Profit Sharing and 401k Plan	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Profit Sharing Plan and 401 Plan Disclosure [Text Block]	13. PROFIT SHARING AND 401K The Company sponsors a profit sharing plan for all employees not may may 401 may 401 $25,000, $34,000 $9,100 March 31, 2021, 2020 2019, 401 two $112,000, $96,000 $116,000 March 31, 2021, 2020 2019,

Note 14 - Product Line and Geog

Note 14 - Product Line and Geographic Information	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	14. PRODUCT LINE AND GEOGRAPHIC INFORMATION Disaggregation of Revenue The following table represents revenue disaggregated by major product line and extraction services for the years ended March 31, 2021, 2020 2019 2021 2020 2019 Packaged sales Astaxanthin packaged $ 14,512 $ 17,811 $ 18,792 Spirulina packaged 7,616 7,986 7,867 Total packaged sales 22,128 25,797 26,659 Bulk sales Astaxanthin bulk 2,279 1,151 966 Spirulina bulk 7,119 4,404 2,340 Total bulk sales 9,398 5,555 3,306 Contract extraction revenue 819 547 237 Total net sales $ 32,345 $ 31,899 $ 30,202 Cost of sales for contract extraction services for the years ended March 31, 2021, 2020 2019 $337,000, $128,000 $142,000, Net sales by geographic region for the years ended March 31, 2021, 2020 2019 2021 2020 2019 (dollars in thousands) Net sales(1): United States $ 21,474 66 % $ 24,855 78 % $ 24,192 80 % Asia / Pacific 5,827 18 % 1,848 6 % 2,597 9 % Europe 3,416 11 % 3,659 11 % 2,316 8 % Other 1,628 5 % 1,537 5 % 1,097 3 % $ 32,345 100 % $ 31,899 100 % $ 30,202 100 % ( 1 Net sales are attributed to countries based on location of customer.

Note 15 - Income Taxes

Note 15 - Income Taxes	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Income Tax Disclosure [Text Block]	15. INCOME TAXES Income tax (expense) benefit for the years ended March 31, 2021, 2020 2019 2021 2020 2019 (in thousands) Current: Federal $ — $ 3 $ 4 State (3 ) (12 ) (21 ) Total current (expense) benefit (3 ) (9 ) (17 ) Deferred: Federal — — — State — — — Total deferred expense — — — Income tax expense $ (3 ) $ (9 ) $ (17 ) On December 22, 2017, 1, 34% 21% January 1, 2018. 21% March 31, 2019 21% March 31, 2021, 2020 2019, March 31, 2021, 2020 2019: 2021 2020 2019 (in thousands) Tax provision at federal statutory income tax rate $ (263 ) $ (114 ) $ 752 Stock-based compensation (11 ) (13 ) 6 (Increase) decrease in valuation allowance (17 ) 159 (1,015 ) State income taxes benefit (expense), net of federal income tax effect 1 (2 ) 264 State rate adjustment — (32 ) (30 ) AMT Credit — 3 4 Deferred Tax True-up 27 — — CARES Act, PPP Loan Forgiveness 298 — — Other, net (38 ) (10 ) 2 Income tax expense $ (3 ) $ (9 ) $ (17 ) The tax effects of temporary differences related to various assets, liabilities and carry forwards that give rise to deferred tax assets and deferred tax liabilities as of March 31, 2021, 2020 2019 2021 2020 2019 (in thousands) Deferred tax assets: Net operating loss carry forwards $ 4,009 $ 3,703 $ 3,611 Inventory 136 492 509 Compensation accrual 136 136 131 Tax credit carry forwards 28 28 28 Interest limitation — 3 174 Operating lease right-of-use assets 1,002 1,108 — Other 34 25 27 Gross deferred tax assets 5,345 5,495 4,480 Less valuation allowance (3,030 ) (3,013 ) (3,172 ) Net deferred tax assets 2,315 2,482 1,308 Deferred tax liabilities: Operating lease obligations (1,002 ) (1,106 ) — Depreciation and amortization (1,313 ) (1,376 ) (1,308 ) Net deferred tax liabilities (2,315 ) (2,482 ) (1,308 ) Net deferred tax assets (liabilities) $ — $ — $ — In assessing the valuation allowance for deferred tax assets, management considers whether it is more likely than not not As of March 31, 2021, 2020 2019, While the Company's long-term financial outlook remains positive, the Company concluded that its ability to rely on its long-term outlook as to future taxable income was limited due to the relative weight of the negative evidence from its recent cumulative losses. The Company's conclusion regarding the need for a valuation allowance against its deferred tax assets could change in the future based on improvements in operating performance, which may At March 31, 2021, Expires March 31, Net Operating Loss State Net Operating Losses Research and Experimentation Tax Credit (in thousands) 2022 $ 2,839 $ — $ — 2023 1,863 — — 2025 — — 8 2026 159 — 2 2027 2,665 — — Thereafter 4,379 712 18 Indefinite 4,506 — — $ 16,411 $ 712 $ 28 Under the Tax Act, the corporate Alternative Minimum Tax (“AMT”) was repealed. Taxpayers with AMT credit carryovers can use the credits to offset regular tax liability for any taxable year. In addition, the AMT credit is refundable in any taxable year beginning after December 31, 2017 December 31, 2022 50% 100% 2021 2022. $60,000 March 31, 2019, March 31, 2020 No March 31, 2021 In response to the COVID- 19 March 2020. may 2018 2020 five not 80% 2018, 2019 2020. 2020 2018 2019, 2019, 100% March 31, 2021. At March 31, 2021, $2,808,000. March 31, 2037 2041. 2020, 2021 2022. March 31, 2021, $8,382,000. March 31, 2030 2041. In addition, the CARES Act loosens the limitation applied to the deductibility of business interest from 30% 50%, 25% 15 100% not March 31, 2021 March 31, 2020. On December 27, 2020, 2021 2020 276 2020 32 2020 27, 2021. The following, in general, represents the open tax years and jurisdictions that the Company used in its evaluation of tax positions. The Company has unused net operating losses carried forward, which cause the statute to remain open up to the amount of unused loss with the statute not Open tax years ending March 31, Jurisdiction 2018 - 2021 U.S. Federal 2018 - 2021 State of Hawaii 2017 - 2021 State of California

Note 16 - Related-party Transac

Note 16 - Related-party Transactions and Balances	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Related Party Transactions Disclosure [Text Block]	16. RELATED-PARTY TRANSACTIONS AND BALANCES During the year ended March 31, 2020, $1,500,000 1% April 12, 2021, may On April 12, 2021, $500,000 may not $500,000, three 5% April 12, 2021, $500,000 $1,900, $1,000,000 1% no 5%. April 12, 2024, may On April 12, 2021, two During the year ended March 31, 2019, May 5, 2018 one not $120,000 March 31, 2019.

Note 17 - Subsequent Events

Note 17 - Subsequent Events	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Subsequent Events [Text Block]	17. SUBSEQUENT EVENTS The Company had no 8 10 16

Note 18 - Selected Quarterly Fi

Note 18 - Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Quarterly Financial Information [Text Block]	18. SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) First Quarter Second Quarter Third Quarter Fourth Quarter Year (in thousands, except per share data) 2021 Net sales $ 7,351 $ 8,571 $ 6,985 $ 9,438 $ 32,345 Gross profit 2,974 3,301 2,071 2,771 11,117 Net income (loss) 138 155 827 (200 ) 920 Net income (loss) per share Basic and diluted 0.02 0.03 0.13 (0.03 ) 0.15 2020 Net sales $ 8,071 $ 7,690 $ 7,504 $ 8,634 $ 31,899 Gross profit 3,676 3,063 2,877 3,084 12,700 Net income (loss) (133 ) 228 171 121 387 Net income (loss) per share Basic and diluted (0.02 ) 0.04 0.03 0.01 0.06

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]	II Cyanotech Corporation Valuation and Qualifying Accounts Years Ended March 31, 2021, 2020 2019 (in thousands) Additions Description Balance at Beginning of Year Charged to Costs and Expense Charged to Other Accounts Deductions Balance at End of Year Allowance for Doubtful Accounts: 2021 $ 13 $ 46 $ — $ 27 $ 32 2020 27 — — 14 13 2019 27 — — — 27

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Use of Estimates, Policy [Policy Text Block]	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosures of any contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the periods reported. Management reviews these estimates and assumptions periodically and reflects the effect of revisions in the period that they are determined to be necessary. Actual results could differ from those estimates and assumptions.
Fair Value of Financial Instruments, Policy [Policy Text Block]	Financial Instruments The Company applies a framework for measuring fair value. That framework provides a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (level 1 3 three Level 1 Inputs to the valuation methodology are unadjusted quoted prices for identical assets or liabilities in active markets that the Company has the ability to access. Level 2 Inputs to the valuation methodology include: ● Quoted prices for similar assets or liabilities in active markets; ● Quoted prices for identical or similar assets or liabilities in inactive markets; ● Inputs other than quoted prices that are observable for the asset or liability; and ● Inputs that are derived principally from or corroborated by observable market data by correlation or other means. If the asset or liability has a specified (contractual) term, the Level 2 Level 3 Inputs to the valuation methodology are unobservable and significant to the fair value. Cash, Accounts Receivable, Accounts Payable, Accrued Expenses and Customer Deposits Line of Credit, Short-Term Contract Obligations and Long-Term Debt
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash Cash primarily consists of cash on hand and cash in bank deposits.
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Concentration Risk The Company maintains its cash accounts in banks located in Hawaii, which are insured by the Federal Deposit Insurance Corporation (“FDIC”) up to $250,000 March 31, 2021 2020 $3,267,000 $1,917,000, March 31, 2021, two 19% 17% March 31, 2020, two 33% 18% March 31, 2019, two 33% 24% two 57% 80%, March 31, 2021 2020,
Accounts Receivable [Policy Text Block]	Accounts Receivable Accounts receivable are recorded at the invoiced amount and do not not 90 not
Inventory, Policy [Policy Text Block]	Inventories Inventories are stated at the lower of cost or net realizable value. Cost is determined using the first first third may The Company recognizes abnormal production costs, including fixed cost variances from normal production capacity, fixed production overhead costs, idle facilities, freight handling costs and spoilage, as an expense in the period incurred, without adjusting overhead absorption rates. Normal production capacity is defined as the production expected to be achieved over a number of periods or seasons under normal circumstances, taking into account the loss of capacity resulting from planned maintenance.
Property, Plant and Equipment, Policy [Policy Text Block]	Equipment and Leasehold Improvements Equipment and leasehold improvements are stated at cost. Depreciation and amortization are provided using the straight-line method over the estimated useful lives for equipment and furniture and fixtures, and the shorter of the land lease term (see Notes 4 8 Equipment 3 to 10 Furniture and fixtures 3 to 7 Leasehold improvements 10 to 25 Capital project costs are accumulated in construction-in-progress until completed, at which time the costs are transferred to the relevant asset and commence depreciation. Repairs and Maintenance costs are expensed in the period incurred. Repairs and maintenance that significantly increase the useful life or value of the asset are capitalized and depreciated over the remaining life of the asset. The Company capitalizes interest cost incurred on funds used to construct property and equipment. The capitalized interest is recorded as part of the asset to which it relates and is amortized over the asset's estimated useful life.
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Impairment of Long-Lived Assets Management reviews long-lived assets, such as equipment, leasehold improvements and purchased intangibles subject to amortization for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not not
Asset Retirement Obligation [Policy Text Block]	Accounting for Asset Retirement Obligations Management evaluates quarterly the potential liability for asset retirement obligations under the Company's lease for its principal facility and corporate headquarters. No March 31, 2021 2020 8
Revenue [Policy Text Block]	Revenue Recognition The Company records revenue based on the five 1 2 3 4 5 may not Revenue is measured as the net amount of consideration expected to be received in exchange for fulfilling a performance obligation. The Company has elected to exclude sales, use and similar taxes from the measurement of the transaction price. The amount of consideration expected to be received and revenue recognized includes estimates of variable consideration, which includes costs for trade promotion programs, coupons, returns and early payment discounts. Such estimates are calculated using historical averages adjusted for any expected changes due to current business conditions and experience. The Company reviews and updates these estimates at the end of each reporting period and the impact of any adjustments are recognized in the period the adjustments are identified. In assessing whether collection of consideration from a customer is probable, the Company considers the customer's ability and intent to pay that amount of consideration when it is due. Payment of invoices is due as specified in the underlying customer agreement, typically 30 one Customer contract liabilities consist of customer deposits received in advance of fulfilling an order and are shown separately on the consolidated balance sheets. During the years ended March 31, 2021 2020, $251,000 $550,000, March 31, 2020 2019, one not
Research and Development Expense, Policy [Policy Text Block]	Research and Development Research and development costs are expensed as incurred and consist primarily of labor, benefits and outside research.
Advertising Cost [Policy Text Block]	Advertising Advertising costs are expensed as incurred. Total advertising expense for the years ended March 31, 2021, 2020 2019 $2,116,000, $1,992,000, $2,413,000,
Income Tax, Policy [Policy Text Block]	Income Taxes Income taxes are accounted for under the asset and liability method. The asset and liability method require the recognition of deferred tax assets and liabilities for the expected future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their tax bases and operating loss and tax credit carry forwards. Deferred tax assets and liabilities are measured using income tax rates applicable to the period in which the tax difference is expected to reverse. Judgment is required in determining any valuation allowance recorded against deferred tax assets, specifically net operating loss carryforwards, tax credit carryforwards and deductible temporary differences that may In evaluating a tax position for recognition, management evaluates whether it is more-likely-than- not not 50% March 31, 2021 2020, no The Company recognizes accrued interest related to unrecognized tax benefits as well as any related penalties in interest expense in its consolidated statements of operations. During the years ended March 31, 2021 2020, no
Share-based Payment Arrangement [Policy Text Block]	Share-Based Compensation The Company accounts for share-based payment arrangements using fair value. The Company currently has no not The Company utilizes the Black-Scholes option pricing model to determine the fair value of each option award. Expected volatilities are based on the historical volatility of the Company's common stock over a period consistent with that of the expected term of the options. The expected term of the options is estimated based on factors such as vesting periods, contractual expiration dates and historical exercise behavior. The risk-free rates for periods within the contractual life of the options are based on the yields of U.S. Treasury instruments with terms comparable to the estimated option terms. The forfeiture rate of the options is based on historical forfeitures of similar grants.
Earnings Per Share, Policy [Policy Text Block]	Per Share Amounts Basic earnings (loss) per common share is calculated by dividing net income (loss) for the year by the weighted average number of common shares outstanding during the year. Diluted earnings per common share is calculated by dividing net income for the year by the sum of the weighted average number of common shares outstanding during the year plus the number of potentially dilutive common shares (“dilutive securities”) that were outstanding during the year. Dilutive securities include restricted stock units and stock options granted pursuant to the Company's stock option plans. Dilutive securities related to the Company's stock option plans are included in the calculation of diluted earnings per common share using the treasury stock method. Potentially dilutive securities are excluded from the computation of earnings per share in periods in which a net loss is reported, as their effect would be antidilutive. A reconciliation of the numerators and denominators of the basic and diluted income (loss) per common share calculations for the years ended March 31, 2021, 2020 2019 12.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted Accounting Pronouncements Effective April 1, 2019, 2016 02, Leases (Topic 842 No. 2018 01, 2018 10, 2018 11, 2018 20 2019 01 No. 2016 02, 842” 842 not 842 not 6. 8 In June 2018, 2018 07, Compensation - Stock Compensation (Topic 718 ) No. 2018 07” No. 2018 07 718 No. 2018 07 first 2020. No. 2018 07 April 1, 2019 no In November 2018, 2018 18 Collaborative Arrangements 2018 18” not 606, April 1, 2018, 2018 18 April 1, 2020 no In August 2018, 2018 15, Customer s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract No. 2018 15” (Subtopic 350 - 40 ) No. 2018 15 April 1, 2020 no In August 2018, 2018 13, Fair Value Measurement - Disclosure Framework (Topic 820 ) No. 2018 13” April 1, 2020, no Recently Issued Accounting Pronouncements In December 2019, 2019 12, Simplifying the Accounting for Income Taxes 2019 12” 2019 12 December 15, 2020, may

Note 2 - Significant Accounti_2

Note 2 - Significant Accounting Policies (Tables)	12 Months Ended
	Mar. 31, 2021
Notes Tables
Property, Plant, and Equipment, Estimated Useful Lives [Table Text Block]	Equipment 3 to 10 Furniture and fixtures 3 to 7 Leasehold improvements 10 to 25

Note 3 - Inventories (Tables)

Note 3 - Inventories (Tables)	12 Months Ended
	Mar. 31, 2021
Notes Tables
Schedule of Inventory, Current [Table Text Block]	2021 2020 (in thousands) Raw materials $ 547 $ 397 Work in process 3,206 4,172 Finished goods 4,423 4,945 Supplies 239 139 Inventories, net $ 8,415 $ 9,653

Note 4 - Equipment and Leaseh_2

Note 4 - Equipment and Leasehold Improvements (Tables)	12 Months Ended
	Mar. 31, 2021
Notes Tables
Property, Plant and Equipment [Table Text Block]	2021 2020 (in thousands) Equipment $ 19,056 $ 18,841 Leasehold improvements 14,703 14,736 Furniture and fixtures 372 369 34,131 33,946 Less accumulated depreciation and amortization (22,740 ) (21,179 ) Construction in-progress 745 275 Equipment and leasehold improvements, net $ 12,136 $ 13,042

Note 6 - Line of Credit and L_2

Note 6 - Line of Credit and Long-term Debt (Tables)	12 Months Ended
	Mar. 31, 2021
Notes Tables
Schedule of Long-term Debt Instruments [Table Text Block]	2021 2020 (in thousands) Line of credit $ 1,000 $ 2,000 Long-term debt 4,673 5,367 Long-term debt – related party 1,500 1,500 Less current maturities (2,210 ) (2,689 ) Long-term debt, excluding current maturities 4,963 6,178 Less unamortized debt issuance costs (140 ) (169 ) Total long-term debt, net of current maturities and unamortized debt issuance costs $ 4,823 $ 6,009
Schedule of Maturities of Long-term Debt [Table Text Block]	Fiscal year ending March 31 (in thousands) 2022 $ 1,210 2023 515 2024 1,287 2025 304 2026 321 Thereafter 2,536 Total principal payments $ 6,173

Note 7 - Accrued Expenses (Tabl

Note 7 - Accrued Expenses (Tables)	12 Months Ended
	Mar. 31, 2021
Notes Tables
Schedule of Accrued Liabilities [Table Text Block]	2021 2020 (in thousands) Wages, commissions, bonus and profit sharing $ 211 $ 295 Vacation 408 301 Rent, interest and legal 86 76 Other accrued expenses 139 177 Total accrued expenses $ 844 $ 849

Note 8 - Operating Leases (Tabl

Note 8 - Operating Leases (Tables)	12 Months Ended
	Mar. 31, 2021
Notes Tables
Schedule of Supplement Balance Sheet Information for Operating Lease [Table Text Block]	Operating leases Balance Sheet Classification March 31, 2021 March 31, (in thousands) Right-of-use assets Operating lease right-of-use assets $ 4,128 $ 4,128 Accumulated lease amortization Operating lease right-of-use assets (611 ) (294 ) Total right-of-use assets $ 3,517 $ 3,834 Current lease liabilities Operating lease obligations $ 343 $ 319 Non-current lease liabilities Long-term operating lease obligations 3,175 3,519 Total lease liabilities $ 3,518 $ 3,838
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Year ending March 31 (in thousands) 2022 $ 593 2023 537 2024 371 2025 371 2026 339 Thereafter 3,353 Total undiscounted lease payments 5,564 Less: present value discount (2,046 ) Total lease liabilities balance $ 3,518

Note 10 - Share-based Compens_2

Note 10 - Share-based Compensation (Tables)	12 Months Ended
	Mar. 31, 2021
Notes Tables
Schedule of Share-based Compensation Shares Authorized Available and Outstanding by Plan [Table Text Block]	As of March 31, 2021 Authorized Available Outstanding 2016 Plan 1,300,000 1,078,858 163,188 2014 Directors Plan 350,000 43,133 12,000 2005 Plan — — 215,300 2004 Directors Plan — — 12,000 Total 1,650,000 1,121,991 402,488
Share-based Payment Arrangement, Option, Activity [Table Text Block]	Option Activity Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value Outstanding at March 31, 2018 589,400 $ 4.06 4.9 $ 675,300 Granted 50,000 3.00 Exercised (49,600 ) 2.17 Expired (50,000 ) 4.82 Outstanding at March 31, 2019 539,800 $ 4.06 4.9 $ 675,300 Granted 5,000 2.11 Exercised (2,112 ) 2.08 Forfeited (104,388 ) 4.58 Expired (120,000 ) 3.53 Outstanding at March 31, 2020 318,300 $ 4.08 3.0 $ — Granted 130,000 2.35 Exercised (19,000 ) 3.59 Forfeited (55,000 ) 3.13 Outstanding at March 31, 2021 374,300 $ 3.64 3.9 $ 129,700 Exercisable at March 31, 2021 249,300 $ 4.29 1.2 $ 10,450
Schedule of Nonvested Share Activity [Table Text Block]	Nonvested Options Shares Weighted Average Grant-Date Fair Value Nonvested at March 31, 2020 37,500 $ 1.52 Granted 130,000 1.20 Vested (5,000 ) 1.27 Forfeited (37,500 ) 1.52 Nonvested at March 31, 2021 125,000 $ 1.19
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]	Outstanding Options Exercisable Options Range of Exercise Prices Number of Shares Remaining Life (Years) Weighted Average Exercise Price Number of Shares Weighted Average Exercise Price $2.11 - $2.34 105,000 9.2 $ 2.28 5,000 $ 2.11 $2.35 - $3.70 47,600 6.1 $ 2.93 22,600 $ 3.32 $3.71 - $3.95 145,200 0.4 $ 3.82 145,200 $ 3.82 $3.96 - $5.91 76,500 1.9 $ 5.62 76,500 $ 5.62 Total stock options 374,300 3.9 $ 3.64 249,300 $ 4.29
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	2021 2020 2019 Exercise Price $ 1.20 $ 1.10 $ 3.00 Volatility 54.44 % 50.61 % 49.94 % Risk Free Rate 0.40 % 1.47 % 2.40 % Vesting Period (in years) 3.0 0 4.0 Forfeiture Rate 0 % 0 % 0 % Expected Life (in years) 6.2 6.9 6.3 Dividend Rate 0 % 0 % 0 %
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]	Nonvested Restricted Stock Units Shares Weighted Average Grant Price Nonvested restricted stock units at March 31, 2018 39,675 $ 3.89 Granted 23,923 $ 4.10 Vested (16,003 ) $ 3.88 Forfeited (8,781 ) $ 4.07 Nonvested restricted stock units at March 31, 2019 38,814 $ 3.98 Granted 4,051 $ 2.67 Vested (24,483 ) $ 3.76 Forfeited (5,616 ) $ 4.01 Nonvested restricted stock units at March 31, 2020 12,766 $ 3.98 Granted 28,647 $ 2.15 Vested (9,135 ) $ 3.97 Forfeited (4,090 ) $ 2.21 Nonvested restricted stock units at March 31, 2021 28,188 $ 2.38

Note 12 - Earnings (Loss) Per_2

Note 12 - Earnings (Loss) Per Share (Tables)	12 Months Ended
	Mar. 31, 2021
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Net Income (loss) (Numerator) Shares (Denominator) Per Share Amount (in thousands, except per share amounts) Year ended March 31, 2021: Basic income per share $ 920 6,070 $ 0.15 Effective dilutive securities—Common stock options — 130 — Diluted income per share $ 920 6,200 $ 0.15 Year ended March 31, 2020: Basic income per share $ 387 5,956 $ 0.06 Effective dilutive securities—Common stock options — 5 — Diluted income per share $ 387 5,961 $ 0.06 Year ended March 31, 2019: Basic and diluted loss per share $ (3,596 ) 5,819 $ (0.62 )

Note 14 - Product Line and Ge_2

Note 14 - Product Line and Geographic Information (Tables)	12 Months Ended
	Mar. 31, 2021
Notes Tables
Revenue from External Customers by Products and Services [Table Text Block]	2021 2020 2019 Packaged sales Astaxanthin packaged $ 14,512 $ 17,811 $ 18,792 Spirulina packaged 7,616 7,986 7,867 Total packaged sales 22,128 25,797 26,659 Bulk sales Astaxanthin bulk 2,279 1,151 966 Spirulina bulk 7,119 4,404 2,340 Total bulk sales 9,398 5,555 3,306 Contract extraction revenue 819 547 237 Total net sales $ 32,345 $ 31,899 $ 30,202
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]	2021 2020 2019 (dollars in thousands) Net sales(1): United States $ 21,474 66 % $ 24,855 78 % $ 24,192 80 % Asia / Pacific 5,827 18 % 1,848 6 % 2,597 9 % Europe 3,416 11 % 3,659 11 % 2,316 8 % Other 1,628 5 % 1,537 5 % 1,097 3 % $ 32,345 100 % $ 31,899 100 % $ 30,202 100 %

Note 15 - Income Taxes (Tables)

Note 15 - Income Taxes (Tables)	12 Months Ended
	Mar. 31, 2021
Notes Tables
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	2021 2020 2019 (in thousands) Current: Federal $ — $ 3 $ 4 State (3 ) (12 ) (21 ) Total current (expense) benefit (3 ) (9 ) (17 ) Deferred: Federal — — — State — — — Total deferred expense — — — Income tax expense $ (3 ) $ (9 ) $ (17 )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	2021 2020 2019 (in thousands) Tax provision at federal statutory income tax rate $ (263 ) $ (114 ) $ 752 Stock-based compensation (11 ) (13 ) 6 (Increase) decrease in valuation allowance (17 ) 159 (1,015 ) State income taxes benefit (expense), net of federal income tax effect 1 (2 ) 264 State rate adjustment — (32 ) (30 ) AMT Credit — 3 4 Deferred Tax True-up 27 — — CARES Act, PPP Loan Forgiveness 298 — — Other, net (38 ) (10 ) 2 Income tax expense $ (3 ) $ (9 ) $ (17 )
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	2021 2020 2019 (in thousands) Deferred tax assets: Net operating loss carry forwards $ 4,009 $ 3,703 $ 3,611 Inventory 136 492 509 Compensation accrual 136 136 131 Tax credit carry forwards 28 28 28 Interest limitation — 3 174 Operating lease right-of-use assets 1,002 1,108 — Other 34 25 27 Gross deferred tax assets 5,345 5,495 4,480 Less valuation allowance (3,030 ) (3,013 ) (3,172 ) Net deferred tax assets 2,315 2,482 1,308 Deferred tax liabilities: Operating lease obligations (1,002 ) (1,106 ) — Depreciation and amortization (1,313 ) (1,376 ) (1,308 ) Net deferred tax liabilities (2,315 ) (2,482 ) (1,308 ) Net deferred tax assets (liabilities) $ — $ — $ —
Schedule of Operating Loss and Tax Credit Carry Forwards [Table Text Block]	Expires March 31, Net Operating Loss State Net Operating Losses Research and Experimentation Tax Credit (in thousands) 2022 $ 2,839 $ — $ — 2023 1,863 — — 2025 — — 8 2026 159 — 2 2027 2,665 — — Thereafter 4,379 712 18 Indefinite 4,506 — — $ 16,411 $ 712 $ 28
Summary of Income Tax Contingencies [Table Text Block]	Open tax years ending March 31, Jurisdiction 2018 - 2021 U.S. Federal 2018 - 2021 State of Hawaii 2017 - 2021 State of California

Note 18 - Selected Quarterly _2

Note 18 - Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Mar. 31, 2021
Notes Tables
Quarterly Financial Information [Table Text Block]	First Quarter Second Quarter Third Quarter Fourth Quarter Year (in thousands, except per share data) 2021 Net sales $ 7,351 $ 8,571 $ 6,985 $ 9,438 $ 32,345 Gross profit 2,974 3,301 2,071 2,771 11,117 Net income (loss) 138 155 827 (200 ) 920 Net income (loss) per share Basic and diluted 0.02 0.03 0.13 (0.03 ) 0.15 2020 Net sales $ 8,071 $ 7,690 $ 7,504 $ 8,634 $ 31,899 Gross profit 3,676 3,063 2,877 3,084 12,700 Net income (loss) (133 ) 228 171 121 387 Net income (loss) per share Basic and diluted (0.02 ) 0.04 0.03 0.01 0.06

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts (Tables)	12 Months Ended
	Mar. 31, 2021
Notes Tables
Valuation Allowances and Reserves [Table Text Block]	Additions Description Balance at Beginning of Year Charged to Costs and Expense Charged to Other Accounts Deductions Balance at End of Year Allowance for Doubtful Accounts: 2021 $ 13 $ 46 $ — $ 27 $ 32 2020 27 — — 14 13 2019 27 — — — 27

Note 1 - Organization and Bas_2

Note 1 - Organization and Basis of Presentation (Details Textual) - USD ($)	1 Months Ended	12 Months Ended
	May 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Apr. 30, 2019	Aug. 30, 2016
Cash and Cash Equivalents, at Carrying Value, Ending Balance		$ 3,767,000	$ 2,417,000
Working Capital (Deficit)		9,298,000	8,369,000
Line of Credit, Current		1,000,000	2,000,000
Long-term Debt and Capital Lease Obligations, Current and Noncurrent		4,613,000
Proceeds from Issuance of Unsecured Debt		1,381,000
SBA CARES Act Paycheck Protection Program [Member]
Proceeds from Issuance of Unsecured Debt	$ 1,381,000
Unsecured Subordinated Loan From Skywords [Member]
Debt Instrument, Face Amount					$ 1,500,000
First Foundation Bank [Member]
Line of Credit, Current		1,000,000	2,000,000
First Foundation Bank [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		2,000,000				$ 2,000,000
Line of Credit, Current		$ 1,000,000	$ 2,000,000

Note 2 - Significant Accounti_3

Note 2 - Significant Accounting Policies (Details Textual)	9 Months Ended	12 Months Ended
	Dec. 31, 2020	Mar. 31, 2021USD ($)	Mar. 31, 2020USD ($)	Mar. 31, 2019USD ($)
Cash, Uninsured Amount		$ 3,267,000	$ 1,917,000
Asset Retirement Obligation, Ending Balance		0	0
Contract with Customer, Liability, Revenue Recognized		251,000	550,000
Advertising Expense		2,116,000	1,992,000	$ 2,413,000
Unrecognized Tax Benefits, Ending Balance		0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total		$ 0	$ 0
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Number of Major Customers	2	2		2
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer Number 1 [Member]
Concentration Risk, Percentage		19.00%	33.00%	33.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer Number 2 [Member]
Concentration Risk, Percentage		17.00%	18.00%	24.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Number 1 [Member]
Concentration Risk, Percentage				57.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Number 2 [Member]
Concentration Risk, Percentage				80.00%

Note 2 - Significant Accounti_4

Note 2 - Significant Accounting Policies - Estimated Useful Lives (Details)	12 Months Ended
	Mar. 31, 2021
Equipment [Member] | Minimum [Member]
Estimated useful lives (Year)	3 years
Equipment [Member] | Maximum [Member]
Estimated useful lives (Year)	10 years
Furniture and Fixtures [Member] | Minimum [Member]
Estimated useful lives (Year)	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Estimated useful lives (Year)	7 years
Leasehold Improvements [Member] | Minimum [Member]
Estimated useful lives (Year)	10 years
Leasehold Improvements [Member] | Maximum [Member]
Estimated useful lives (Year)	25 years

Note 3 - Inventories (Details T

Note 3 - Inventories (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Inventory Abnormal Production Costs	$ 110,000	$ 0	$ 250,000
Non Inventoriable Fixed Costs	$ 179,000	$ 343,000	$ 176,000

Note 3 - Inventories - Componen

Note 3 - Inventories - Components of Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Raw materials	$ 547	$ 397
Work in process	3,206	4,172
Finished goods	4,423	4,945
Supplies	239	139
Inventories, net	$ 8,415	$ 9,653

Note 4 - Equipment and Leaseh_3

Note 4 - Equipment and Leasehold Improvements (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Asset Impairment Charges, Total	$ 64,000	$ 0
Depreciation, Depletion and Amortization, Total	$ 1,748,000	$ 1,934,000	$ 1,908,000

Note 4 - Equipment and Leaseh_4

Note 4 - Equipment and Leasehold Improvements - Components of Equipment and Leasehold Improvements (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Equipment and leasehold improvements, gross	$ 34,131	$ 33,946
Less accumulated depreciation and amortization	(22,740)	(21,179)
Construction in-progress	745	275
Equipment and leasehold improvements, net	12,136	13,042
Equipment [Member]
Equipment and leasehold improvements, gross	19,056	18,841
Leasehold Improvements [Member]
Equipment and leasehold improvements, gross	14,703	14,736
Furniture and Fixtures [Member]
Equipment and leasehold improvements, gross	$ 372	$ 369

Note 5 - Short-term Contract _2

Note 5 - Short-term Contract Obligation (Details Textual)	Nov. 30, 2018USD ($)a	Mar. 31, 2021USD ($)	Mar. 31, 2020USD ($)	Mar. 31, 2019USD ($)	Jun. 30, 2020USD ($)
Noncash or Part Noncash Acquisition, Value of Assets Acquired, Total				$ 495,000
Payments to Acquire Buildings				100,000
Issuance of Short Term Obligations				$ (395,000)
Short-term Non-bank Loans and Notes Payable			38,000
Short-term Obligation for Cellana Asset Purchase [Member]
Debt Instrument, Face Amount	$ 180,000
Debt Instrument, Interest Rate, Stated Percentage	6.25%
Debt Instrument, Periodic Payment, Number of Monthly Payments	4
Short-term Non-bank Loans and Notes Payable		0	0
Short-term Obligation for Cellana Asset Purchase 2 [Member]
Debt Instrument, Face Amount	$ 215,000
Debt Instrument, Periodic Payment, Number of Monthly Payments	12
Short-term Non-bank Loans and Notes Payable		$ 0	$ 38,000
Debt Instrument, Hold-back, Amount					$ 38,000
Cellana Asset Purchase [Member]
Noncash or Part Noncash Acquisition, Value of Assets Acquired, Total	$ 495,000
Payments to Acquire Buildings	100,000
Issuance of Short Term Obligations	$ 395,000
Research Facility Owned by Cellana [Member]
Area of Real Estate Property (Acre) | a	6

Note 6 - Line of Credit and L_3

Note 6 - Line of Credit and Long-term Debt (Details Textual)	Apr. 30, 2019USD ($)	Aug. 30, 2016USD ($)	Sep. 18, 2015USD ($)	Jul. 30, 2015USD ($)	Aug. 14, 2012USD ($)	May 31, 2020USD ($)	Feb. 29, 2016USD ($)	Jul. 31, 2015USD ($)	Mar. 31, 2021USD ($)	Mar. 31, 2020USD ($)	Mar. 31, 2019USD ($)	Aug. 30, 2018	Oct. 06, 2017USD ($)
Line of Credit, Current									$ 1,000,000	$ 2,000,000
Debt Covenant, Minimum Current Ratio												1.5
Repayments of Notes Payable			$ 500,000
Long-term Debt and Capital Lease Obligations, Current and Noncurrent									4,613,000
Debt Issuance Costs, Net, Total									140,000	169,000
Proceeds from Issuance of Unsecured Debt									1,381,000
Gain (Loss) on Extinguishment of Debt, Total									1,389,000
Long-term Debt, Current Maturities, Total									2,210,000	2,689,000
Long-term Debt, Excluding Current Maturities, Total									4,823,000	6,009,000
Long-term Debt, Total									6,173,000
Finance Lease, Cost									15,000	25,000
Finance Lease Agreement with Bank of the West [Member]
Debt Instrument, Interest Rate, Stated Percentage							4.18%
Finance Lease, Right-of-Use Asset, before Accumulated Amortization							$ 51,000
Finance Lease Liability, Number of Periodic Payments							60
Finance Lease, Liability, Total									0	11,000
Finance Lease Agreement with Huntington Technology Finance [Member]
Debt Instrument, Interest Rate, Stated Percentage								6.57%
Finance Lease, Right-of-Use Asset, before Accumulated Amortization								$ 174,000
Finance Lease Liability, Number of Periodic Payments								60
Finance Lease, Liability, Total									0	13,000
Unsecured Subordinated Loan [Member]
Long-term Debt, Gross									$ 1,500,000	$ 1,500,000
The 2015 Loan Agreement [Member]
Debt Instrument Reference Rate									3.25%	4.75%
Proceeds from Issuance of Debt				$ 2,500,000
Debt Instrument, Term (Year)				7 years
Debt Instrument, Prepayment Penalty Percentage				5.00%
Debt Instrument, Prepayment Penalty Percentage Reduction During Each Year				1.00%
Long-term Debt and Capital Lease Obligations, Current and Noncurrent									$ 635,000	$ 1,027,000
Debt Instrument One Time Origination and Guaranty Fees									$ 113,900
Debt Instrument Annual Renewal Fee Payable Percentage									0.50%
Debt Instrument Guaranteed Portion									80.00%
Term Loan Agreement, Maturing on August 14, 2032 [Member]
Debt Instrument Reference Rate									3.25%	4.75%
Debt Instrument, Basis Spread on Variable Rate									1.00%
Proceeds from Issuance of Debt					$ 5,500,000
Long-term Debt and Capital Lease Obligations, Current and Noncurrent									$ 3,978,000	$ 4,222,000
Debt Instrument Interest Payment Period (Month)					1 year
Debt Instrument Amortization Period (Year)					19 years
Debt Instrument One Time Origination and Guaranty Fees									$ 214,500
Debt Instrument Annual Renewal Fee Payable Percentage									0.25%
Debt Instrument Guaranteed Portion									80.00%
Term Loan Agreement, Promissory Note One [Member]
Proceeds from Issuance of Debt					$ 2,250,000
Term Loan Agreement, Promissory Note Two [Member]
Proceeds from Issuance of Debt					$ 3,250,000
SBA CARES Act Paycheck Protection Program [Member]
Proceeds from Issuance of Unsecured Debt						$ 1,381,000
Debt Instrument, Decrease, Principal Forgiveness									$ 1,381,000
Debt Instrument, Decrease, Accrued Interest Forgiveness									8,000
Gain (Loss) on Extinguishment of Debt, Total									$ 1,389,000
Skywords Note [Member] | Unsecured Subordinated Loan [Member]
Debt Instrument, Face Amount	$ 1,500,000									$ 1,500,000
Debt Instrument, Interest Rate, Effective Percentage									4.25%	5.50%
Long-term Debt, Gross									$ 1,500,000	$ 1,500,000
Long-term Debt, Current Maturities, Total									500,000
Long-term Debt, Excluding Current Maturities, Total									1,000,000
Equipment Finance Agreement [Member]
Debt Instrument, Interest Rate, Stated Percentage													4.75%
Debt Agreement, Maximum Borrowing Capacity													$ 175,000
Long-term Debt, Total									$ 60,000	$ 94,000
Minimum [Member] | The 2015 Loan Agreement [Member]
Debt Instrument, Interest Rate, Stated Percentage				6.00%
Minimum [Member] | Term Loan Agreement, Maturing on August 14, 2032 [Member]
Debt Instrument, Interest Rate During Period									5.50%
Prime Rate [Member] | The 2015 Loan Agreement [Member]
Debt Instrument, Basis Spread on Variable Rate				2.00%
Prime Rate [Member] | Skywords Note [Member] | Unsecured Subordinated Loan [Member]
Debt Instrument, Basis Spread on Variable Rate	1.00%									1.00%
First Foundation Bank [Member]
Line of Credit, Current									$ 1,000,000	$ 2,000,000
First Foundation Bank [Member] | Minimum [Member]
Debt Instrument, Interest Rate, Stated Percentage		5.25%
First Foundation Bank [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 2,000,000							2,000,000
Line of Credit, Current									$ 1,000,000	$ 2,000,000
First Foundation Bank [Member] | Revolving Credit Facility [Member] | Prime Rate [Member]
Debt Instrument Reference Rate									3.25%	4.75%
Debt Instrument, Basis Spread on Variable Rate		2.00%

Note 6 - Line of Credit and L_4

Note 6 - Line of Credit and Long-term Debt - Summary of Line of Credit and Long-term Debt (Details) - USD ($)	Mar. 31, 2021	Mar. 31, 2020
Less current maturities	$ (2,210,000)	$ (2,689,000)
Long-term debt, excluding current maturities	4,963,000	6,178,000
Less unamortized debt issuance costs	(140,000)	(169,000)
Total long-term debt, net of current maturities and unamortized debt issuance costs	4,823,000	6,009,000
Line of Credit [Member]
Long-term debt	1,000,000	2,000,000
Long-term Debt, Excluding Related Party Debt [Member]
Long-term debt	4,673,000	5,367,000
Unsecured Subordinated Loan [Member]
Long-term debt	$ 1,500,000	$ 1,500,000

Note 6 - Line of Credit and L_5

Note 6 - Line of Credit and Long-term Debt - Future Payments (Details) $ in Thousands	Mar. 31, 2021USD ($)
2022	$ 1,210
2023	515
2024	1,287
2025	304
2026	321
Thereafter	2,536
Total principal payments	$ 6,173

Note 7 - Accrued Expenses - Com

Note 7 - Accrued Expenses - Components of Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Wages, commissions, bonus and profit sharing	$ 211	$ 295
Vacation	408	301
Rent, interest and legal	86	76
Other accrued expenses	139	177
Total accrued expenses	$ 844	$ 849

Note 8 - Operating Leases (Deta

Note 8 - Operating Leases (Details Textual)	Apr. 19, 2021USD ($)	Mar. 31, 2021USD ($)	Mar. 31, 2020USD ($)	Mar. 31, 2019USD ($)
Operating Leases, Expense, Contingent Rentals		$ 50,000	$ 49,000	$ 54,000
Operating Lease, Weighted Average Remaining Lease Term (Year)		13 years 182 days	13 years 328 days
Operating Lease, Cost		$ 591,000	$ 592,000
Operating Lease, Weighted Average Discount Rate, Percent			7.50%
Operating Lease, Expense		616,000	$ 623,000	588,000
State and Local Jurisdiction [Member]
Real Estate Tax Expense		$ 28,000	$ 28,000	$ 29,000
Leases For Two Buildings [Member] | Subsequent Event [Member]
Lessee, Operating Lease, Term of Contract (Year)	7 years
Lessee, Operating Lease, Number of Leases	2
Lessee, Operating Lease, Monthly Installments	$ 8,400
HAWAII1 [Member]
Leases, Number of Lease Properties		2
HAWAII1 [Member] | Commercial Lease Expiring in 2035 [Member]
Lessee, Operating Lease, Term of Contract (Year)		40 years
HAWAII1 [Member] | Commercial Lease Expiring in 2037 [Member]
Lessee, Operating Lease, Term of Contract (Year)		19 years

Note 8 - Operating Leases - Sup

Note 8 - Operating Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Right-of-use assets	$ 4,128	$ 4,128
Accumulated lease amortization	(611)	(294)
Total right-of-use assets	3,517	3,834
Current lease liabilities	343	319
Non-current lease liabilities	3,175	3,519
Total lease liabilities	$ 3,518	$ 3,838

Note 8 - Operating Leases - Ope

Note 8 - Operating Leases - Operating Leases Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
2022	$ 593
2023	537
2024	371
2025	371
2026	339
Thereafter	3,353
Total undiscounted lease payments	5,564
Less: present value discount	(2,046)
Total lease liabilities balance	$ 3,518	$ 3,838

Note 9 - Other Commitments an_2

Note 9 - Other Commitments and Contingencies (Details Textual) - USD ($)	1 Months Ended
	Apr. 30, 2016	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Purchase Obligation, Total		$ 1,005,000	$ 825,000	$ 951,000
Purchase Obligation Agreement, Term (Year)	10 years

Note 10 - Share-based Compens_3

Note 10 - Share-based Compensation (Details Textual)	May 20, 2021$ / sharesshares	Apr. 06, 2021$ / sharesshares	Mar. 31, 2021USD ($)$ / sharesshares	Mar. 31, 2020USD ($)$ / sharesshares	Mar. 31, 2019USD ($)$ / sharesshares	Aug. 25, 2016shares	Aug. 28, 2014shares
Number of Shareholder Approved Share-based Compensation Plans				2
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)			1,121,991
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)			1,650,000
Share Price (in dollars per share) | $ / shares			$ 3.30	$ 2.06	$ 3.24
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $			$ 6,000	$ 1,000	$ 77,000
ShareBased Compensation Arrangement By Share Based Payment Award Weighted Average Grant Date Fair Value Options Granted | $			155,000	5,000	76,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $			$ 6,000	$ 169,000	$ 72,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares			$ 2.35	$ 2.11	$ 3
Former Executive [Member]
Share-based Payment Arrangement, Expense | $				$ 205,000
Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares)	50,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 2.96
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense | $			$ 29,000	133,000	$ 77,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $			$ 122,000	$ 52,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			3 years 36 days	2 years 292 days
Share-based Payment Arrangement, Option [Member] | Former Executive [Member]
Share-based Payment Arrangement, Expense | $				$ 109,000
Share-based Payment Arrangement, Option [Member] | Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Restricted Stock [Member] | Share-based Payment Arrangement, Nonemployee [Member]
Share-based Payment Arrangement, Expense | $			$ 158,000	$ 158,000	$ 170,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)			66,385	78,882	47,223
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)			28,647	4,051	23,923
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares			$ 2.15	$ 2.67	$ 4.10
Restricted Stock Units (RSUs) [Member] | Former Executive [Member]
Share-based Payment Arrangement, Expense | $				$ 6,000
Restricted Stock Units (RSUs) [Member] | Employees [Member]
Share-based Payment Arrangement, Expense | $			$ 28,000	81,000	$ 75,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $			$ 42,000	$ 18,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			2 years 36 days	1 year 109 days
Restricted Stock Units (RSUs) [Member] | Employees [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		2 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		1,072
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares		$ 3.36
Maximum [Member] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)				10 years
The 2005 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)			0	0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)						1,300,000
The 2005 Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized for Issuance in Connection with Performance Awards and Stock Awards (in shares)						600,000
2004 Directors Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)				0
The 2016 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)			1,078,858
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)			1,300,000
2014 Directors Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)			43,133
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)			350,000				350,000

Note 10 - Share-based Compens_4

Note 10 - Share-based Compensation - Shares Authorized, Available for Future Grant and Outstanding Under Each Plan (Details) - shares	Mar. 31, 2021	Mar. 31, 2020	Aug. 25, 2016	Aug. 28, 2014
Authorized (in shares)	1,650,000
Available (in shares)	1,121,991
Outstanding (in shares)	402,488
The 2016 Plan [Member]
Authorized (in shares)	1,300,000
Available (in shares)	1,078,858
Outstanding (in shares)	163,188
2014 Directors Plan [Member]
Authorized (in shares)	350,000			350,000
Available (in shares)	43,133
Outstanding (in shares)	12,000
The 2005 Plan [Member]
Authorized (in shares)			1,300,000
Available (in shares)	0	0
Outstanding (in shares)	215,300
The 2004 Directors Plan [Member]
Authorized (in shares)
Available (in shares)	0
Outstanding (in shares)	12,000

Note 10 - Share-based Compens_5

Note 10 - Share-based Compensation - Summary of Option Activity Under Stock Plans (Details) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Outstanding (in shares)	318,300	539,800	589,400
Outstanding, weighted average exercise price (in dollars per share)	$ 4.08	$ 4.06	$ 4.06
Outstanding, weighted average remaining contractual term (Year)	3 years 328 days	3 years	4 years 328 days	4 years 328 days
Outstanding, aggregate intrinsic value	$ 129,700		$ 675,300
Granted (in shares)	130,000	5,000	50,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 2.35	$ 2.11	$ 3
Exercised (in shares)	(19,000)	(2,112)	(49,600)
Exercised, weighted average exercise price (in dollars per share)	$ 3.59	$ 2.08	$ 2.17
Expired (in shares)		(120,000)	(50,000)
Expired, weighted average exercise price (in dollars per share)		$ 3.53	$ 4.82
Forfeited (in shares)	(55,000)	(104,388)
Forfeited, weighted average exercise price (in dollars per share)	$ 3.13	$ 4.58
Outstanding (in shares)	374,300	318,300	539,800	589,400
Outstanding, weighted average exercise price (in dollars per share)	$ 3.64	$ 4.08	$ 4.06	$ 4.06
Exercisable (in shares)	249,300
Exercisable, weighted average exercise price (in dollars per share)	$ 4.29
Exercisable, weighted average remaining contractual term (Year)	1 year 73 days
Exercisable, aggregate intrinsic value	$ 10,450

Note 10 - Share-based Compens_6

Note 10 - Share-based Compensation - Summary of Non-vested Options (Details) - $ / shares	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Nonvested (in shares)	37,500
Nonvested (in dollars per share)	$ 1.52
Granted (in shares)	130,000	5,000	50,000
Granted (in dollars per share)	$ 1.20
Vested (in shares)	(5,000)
Vested (in dollars per share)	$ 1.27
Forfeited (in shares)	(37,500)
Forfeited (in dollars per share)	$ 1.52
Nonvested (in shares)	125,000	37,500
Nonvested (in dollars per share)	$ 1.19	$ 1.52

Note 10 - Share-based Compens_7

Note 10 - Share-based Compensation - Summary of the Weighted-average Characteristics of Outstanding Stock Options (Details)	12 Months Ended
	Mar. 31, 2021$ / sharesshares
Outstanding Options Number of Shares (in shares) | shares	374,300
Outstanding Options Remaining Life (Year)	3 years 328 days
Outstanding Options Weighted Average Price (in dollars per share)	$ 3.64
Exercisable Options Number of Shares (in shares) | shares	249,300
Exercisable Options Weighted Average Price (in dollars per share)	$ 4.29
Range 01 [Member]
Lower Range of Exercise (in dollars per share)	2.11
Upper Range of Exercise (in dollars per share)	$ 2.34
Outstanding Options Number of Shares (in shares) | shares	105,000
Outstanding Options Remaining Life (Year)	9 years 73 days
Outstanding Options Weighted Average Price (in dollars per share)	$ 2.28
Exercisable Options Number of Shares (in shares) | shares	5,000
Exercisable Options Weighted Average Price (in dollars per share)	$ 2.11
Range 02 [Member]
Lower Range of Exercise (in dollars per share)	2.35
Upper Range of Exercise (in dollars per share)	$ 3.70
Outstanding Options Number of Shares (in shares) | shares	47,600
Outstanding Options Remaining Life (Year)	6 years 36 days
Outstanding Options Weighted Average Price (in dollars per share)	$ 2.93
Exercisable Options Number of Shares (in shares) | shares	22,600
Exercisable Options Weighted Average Price (in dollars per share)	$ 3.32
Range 03 [Member]
Lower Range of Exercise (in dollars per share)	3.71
Upper Range of Exercise (in dollars per share)	$ 3.95
Outstanding Options Number of Shares (in shares) | shares	145,200
Outstanding Options Remaining Life (Year)	146 days
Outstanding Options Weighted Average Price (in dollars per share)	$ 3.82
Exercisable Options Number of Shares (in shares) | shares	145,200
Exercisable Options Weighted Average Price (in dollars per share)	$ 3.82
Range 04 [Member]
Lower Range of Exercise (in dollars per share)	3.96
Upper Range of Exercise (in dollars per share)	$ 5.91
Outstanding Options Number of Shares (in shares) | shares	76,500
Outstanding Options Remaining Life (Year)	1 year 328 days
Outstanding Options Weighted Average Price (in dollars per share)	$ 5.62
Exercisable Options Number of Shares (in shares) | shares	76,500
Exercisable Options Weighted Average Price (in dollars per share)	$ 5.62

Note 10 - Share-based Compens_8

Note 10 - Share-based Compensation - Summary of Valuation Assumptions Related to Options Granted (Details) - $ / shares	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Exercise Price (in dollars per share)	$ 1.20	$ 1.10	$ 3
Volatility	54.44%	50.61%	49.94%
Risk Free Rate	0.40%	1.47%	2.40%
Vesting Period (Year)	3 years	0 years	4 years
Forfeiture Rate	0.00%	0.00%	0.00%
Expected Life (Year)	6 years 73 days	6 years 328 days	6 years 109 days
Dividend Rate	0.00%	0.00%	0.00%

Note 10 - Share-based Compens_9

Note 10 - Share-based Compensation - Restricted Stock Units (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Nonvested restricted stock units (in shares)	12,766	38,814	39,675
Nonvested restricted stock units, weighted average grant price (in dollars per share)	$ 3.98	$ 3.98	$ 3.89
Granted (in shares)	28,647	4,051	23,923
Granted, weighted average grant price (in dollars per share)	$ 2.15	$ 2.67	$ 4.10
Vested (in shares)	(9,135)	(24,483)	(16,003)
Vested, weighted average grant price (in dollars per share)	$ 3.97	$ 3.76	$ 3.88
Forfeited (in shares)	(4,090)	(5,616)	(8,781)
Forfeited, weighted average grant price (in dollars per share)	$ 2.21	$ 4.01	$ 4.07
Nonvested restricted stock units (in shares)	28,188	12,766	38,814
Nonvested restricted stock units, weighted average grant price (in dollars per share)	$ 2.38	$ 3.98	$ 3.98

Note 11 - Common and Preferre_2

Note 11 - Common and Preferred Stock (Details Textual) - shares	Mar. 31, 2021	Mar. 31, 2020
Shares Authorized (in shares)	60,000,000
Common Stock, Shares Authorized (in shares)	50,000,000	50,000,000
Preferred Stock, Shares Authorized (in shares)	10,000,000	10,000,000
Preferred Stock, Shares Issued, Total (in shares)	0	0
Preferred Stock, Shares Outstanding, Ending Balance (in shares)	0	0

Note 12 - Earnings (Loss) Per_3

Note 12 - Earnings (Loss) Per Share (Details Textual) - shares	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)			50,000
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	28,188	12,766	38,814

Note 12 - Earnings (Loss) Per_4

Note 12 - Earnings (Loss) Per Share - Summary of Reconciliations Between the Numerator and the Denominator of the Basic and Diluted Earnings Per Share Computations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Net income (loss)	$ (200)	$ 827	$ 155	$ 138	$ 121	$ 171	$ 228	$ (133)	$ 920	$ 387	$ (3,596)
Shares outstanding - basic (in shares)									6,070	5,956	5,819
Earnings per share - basic (in dollars per share)									$ 0.15	$ 0.06	$ (0.62)
Effective dilutive securities—Common stock options
Effective dilutive securities—Common stock options (in shares)									130	5
Net income - diluted									$ 920	$ 387
Shares outstanding - diluted (in shares)									6,200	5,961	5,819
Diluted income per share (in dollars per share)									$ 0.15	$ 0.06	$ (0.62)
Basic (in shares)									6,070	5,956	5,819
Diluted (in shares)									6,200	5,961	5,819
Diluted (in dollars per share)									$ 0.15	$ 0.06	$ (0.62)
Basic and diluted loss per share (in shares)											5,819
Basic and diluted loss per share (in dollars per share)	$ (0.03)	$ 0.13	$ 0.03	$ 0.02	$ 0.01	$ 0.03	$ 0.04	$ (0.02)	$ 0.15	$ 0.06	$ (0.62)

Note 13 - Profit Sharing and _2

Note 13 - Profit Sharing and 401k Plan (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Profit Sharing Defined Contribution Plan [Member]
Defined Contribution Plan, Cost	$ 25,000	$ 34,000	$ 9,100
Defined Contribution 401K Plan [Member]
Defined Contribution Plan, Cost	$ 112,000	$ 96,000	$ 116,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay		2.00%

Note 14 - Product Line and Ge_3

Note 14 - Product Line and Geographic Information (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Cost of Goods and Services Sold, Total	$ 21,228,000	$ 19,199,000	$ 19,736,000
Contract Extraction [Member]
Cost of Goods and Services Sold, Total	$ 337,000	$ 128,000	$ 142,000

Note 14 - Product Line and Ge_4

Note 14 - Product Line and Geographic Information - Net Sales by Product Line (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Total net sales	$ 32,345	$ 31,899	$ 30,202
Packaged Astaxanthin [Member]
Total net sales	14,512	17,811	18,792
Packaged Spirulina [Member]
Total net sales	7,616	7,986	7,867
Packaged Products [Member]
Total net sales	22,128	25,797	26,659
Bulk Astaxanthin [Member]
Total net sales	2,279	1,151	966
Bulk Spirulina [Member]
Total net sales	7,119	4,404	2,340
Bulk Products [Member]
Total net sales	9,398	5,555	3,306
Contract Extraction [Member]
Total net sales	$ 819	$ 547	$ 237

Note 14 - Product Line and Ge_5

Note 14 - Product Line and Geographic Information - Sales by Geographic Region (Details) - USD ($) $ in Thousands		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Net sales		$ 32,345	$ 31,899	$ 30,202
Geographic Concentration Risk [Member]
Net sales	[1]	$ 32,345	$ 31,899	$ 30,202
Net sales, percent	[1]	100.00%	100.00%	100.00%
Geographic Concentration Risk [Member] | UNITED STATES
Net sales	[1]	$ 21,474	$ 24,855	$ 24,192
Net sales, percent	[1]	66.00%	78.00%	80.00%
Geographic Concentration Risk [Member] | Asia Pacific [Member]
Net sales	[1]	$ 5,827	$ 1,848	$ 2,597
Net sales, percent	[1]	18.00%	6.00%	9.00%
Geographic Concentration Risk [Member] | Europe [Member]
Net sales	[1]	$ 3,416	$ 3,659	$ 2,316
Net sales, percent	[1]	11.00%	11.00%	8.00%
Geographic Concentration Risk [Member] | Other Countries [Member]
Net sales	[1]	$ 1,628	$ 1,537	$ 1,097
Net sales, percent	[1]	5.00%	5.00%	3.00%
[1]	Net sales are attributed to countries based on location of customer.

Note 15 - Income Taxes (Details

Note 15 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Mar. 13, 2021
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
Unrecognized Tax Benefits, Ending Balance	$ 0	$ 0
Operating Loss Carryforwards, Total	16,411,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	712,000
California Franchise Tax Board [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	2,808,000
Hawaii Department of Taxation [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	8,382,000
Alternative Minimum Tax [Member]
Tax Credit Carryforward, Amount			$ 60,000
Taxable Year Beginning After 2017 and Before 2022 [Member]
Alternative Minimum Tax Refund Percentage				50.00%
Expiration Tax Year 2022 [Member]
Alternative Minimum Tax Refund Percentage				100.00%
Operating Loss Carryforwards, Total	2,839,000
Expiration Tax Year 2022 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total

Note 15 - Income Taxes - Compon

Note 15 - Income Taxes - Components of Income Tax Benefit (Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Federal		$ 3	$ 4
State	(3)	(12)	(21)
Total current (expense) benefit	(3)	(9)	(17)
Federal
State
Total deferred expense
Income tax expense	$ (3)	$ (9)	$ (17)

Note 15 - Income Taxes - Reconc

Note 15 - Income Taxes - Reconciliation of the Amount of Income Taxes Computed at the Federal Statutory Rate to the Amount Reflected in Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Tax provision at federal statutory income tax rate	$ (263)	$ (114)	$ 752
Stock-based compensation	(11)	(13)	6
(Increase) decrease in valuation allowance	(17)	159	(1,015)
State income taxes benefit (expense), net of federal income tax effect	1	(2)	264
State rate adjustment		(32)	(30)
AMT Credit		3	4
Deferred Tax True-up	27
CARES Act, PPP Loan Forgiveness	298
Other, net	(38)	(10)	2
Income tax expense	$ (3)	$ (9)	$ (17)

Note 15 - Income Taxes - Effect

Note 15 - Income Taxes - Effects of Temporary Differences Related to Various Assets, Liabilities and Carry Forwards That Give Rise to Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Net operating loss carry forwards	$ 4,009	$ 3,703	$ 3,611
Inventory	136	492	509
Compensation accrual	136	136	131
Tax credit carry forwards	28	28	28
Interest limitation		3	174
Operating lease right-of-use assets	1,002	1,108
Other	34	25	27
Gross deferred tax assets	5,345	5,495	4,480
Less valuation allowance	(3,030)	(3,013)	(3,172)
Net deferred tax assets	2,315	2,482	1,308
Operating lease obligations	(1,002)	(1,106)
Depreciation and amortization	(1,313)	(1,376)	(1,308)
Net deferred tax liabilities	(2,315)	(2,482)	(1,308)
Net deferred tax assets (liabilities)	$ 0	$ 0

Note 15 - Income Taxes - Net Op

Note 15 - Income Taxes - Net Operating Loss Carry Forwards and Tax Credit Carry Forwards Available to Offset Future Federal Income Tax (Details) $ in Thousands	Mar. 31, 2021USD ($)
Operating Loss Carryforwards, Total	$ 16,411
Research Tax Credit Carryforward [Member]
Research and Experimentation Tax Credits	28
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	712
Expiration Tax Year 2022 [Member]
Operating Loss Carryforwards, Total	2,839
Expiration Tax Year 2022 [Member] | Research Tax Credit Carryforward [Member]
Research and Experimentation Tax Credits
Expiration Tax Year 2022 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total
Expiration Tax Year 2023 [Member]
Operating Loss Carryforwards, Total	1,863
Expiration Tax Year 2023 [Member] | Research Tax Credit Carryforward [Member]
Research and Experimentation Tax Credits
Expiration Tax Year 2023 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total
Expiration Tax Year 2025 [Member]
Operating Loss Carryforwards, Total
Expiration Tax Year 2025 [Member] | Research Tax Credit Carryforward [Member]
Research and Experimentation Tax Credits	8
Expiration Tax Year 2025 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total
Expiration Tax Year 2026 [Member]
Operating Loss Carryforwards, Total	159
Expiration Tax Year 2026 [Member] | Research Tax Credit Carryforward [Member]
Research and Experimentation Tax Credits	2
Expiration Tax Year 2026 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total
Expiration Tax Year 2027 [Member]
Operating Loss Carryforwards, Total	2,665
Expiration Tax Year 2027 [Member] | Research Tax Credit Carryforward [Member]
Research and Experimentation Tax Credits
Expiration Tax Year 2027 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total
Expiration Tax Year After 2027 [Member]
Operating Loss Carryforwards, Total	4,379
Expiration Tax Year After 2027 [Member] | Research Tax Credit Carryforward [Member]
Research and Experimentation Tax Credits	18
Expiration Tax Year After 2027 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	712
Indefinite [Member]
Operating Loss Carryforwards, Total	4,506
Indefinite [Member] | Research Tax Credit Carryforward [Member]
Research and Experimentation Tax Credits
Indefinite [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total

Note 15 - Income Taxes - Open T

Note 15 - Income Taxes - Open Tax Years and Jurisdictions That the Company Used in Its Evaluation of Tax Positions (Details)	12 Months Ended	24 Months Ended
	Mar. 31, 2021	Mar. 31, 2021
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]
Open tax year	2018
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]
Open tax year		2021
State and Local Jurisdiction [Member] | Hawaii Department of Taxation [Member] | Earliest Tax Year [Member]
Open tax year	2018
State and Local Jurisdiction [Member] | Hawaii Department of Taxation [Member] | Latest Tax Year [Member]
Open tax year		2021
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] | Earliest Tax Year [Member]
Open tax year	2017
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] | Latest Tax Year [Member]
Open tax year		2021

Note 16 - Related-party Trans_2

Note 16 - Related-party Transactions and Balances (Details Textual) - USD ($)	Apr. 12, 2021	Apr. 30, 2019	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Repayments of Long-term Debt, Total			$ 670,000	$ 611,000	$ 576,000
Interest Paid, Excluding Capitalized Interest, Operating Activities			446,000	618,000	380,000
Long-term Debt, Total			$ 6,173,000
Director [Member]
Due to Related Parties, Total					$ 120,000
Subsequent Event [Member] | Conversion of Skywords Note Into Revolving Loans [Member]
Debt Conversion, Original Debt, Amount	$ 500,000
Skywords Note [Member] | Subsequent Event [Member]
Repayments of Long-term Debt, Total	500,000
Interest Paid, Excluding Capitalized Interest, Operating Activities	1,900
Skywords Note [Member] | Unsecured Subordinated Loan [Member]
Debt Instrument, Face Amount		$ 1,500,000		$ 1,500,000
Skywords Note [Member] | Unsecured Subordinated Loan [Member] | Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		1.00%		1.00%
Skywords Amended Note [Member] | Subsequent Event [Member]
Debt Instrument, Face Amount	$ 500,000
Debt Instrument, Term (Year)	3 years
Debt Instrument, Floor Interest Rate	5.00%
Long-term Debt, Total	$ 1,000,000
Skywords Amended Note [Member] | Prime Rate [Member] | Subsequent Event [Member]
Debt Instrument, Basis Spread on Variable Rate	1.00%

Note 18 - Selected Quarterly _3

Note 18 - Selected Quarterly Financial Data (Unaudited) - Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Net sales	$ 9,438	$ 6,985	$ 8,571	$ 7,351	$ 8,634	$ 7,504	$ 7,690	$ 8,071	$ 32,345	$ 31,899
Gross profit	2,771	2,071	3,301	2,974	3,084	2,877	3,063	3,676	11,117	12,700	$ 10,466
Net income (loss)	$ (200)	$ 827	$ 155	$ 138	$ 121	$ 171	$ 228	$ (133)	$ 920	$ 387	$ (3,596)
Basic and diluted (in dollars per share)	$ (0.03)	$ 0.13	$ 0.03	$ 0.02	$ 0.01	$ 0.03	$ 0.04	$ (0.02)	$ 0.15	$ 0.06	$ (0.62)

Schedule II - Valuation and Q_3

Schedule II - Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Details) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Balance at Beginning of Year	$ 13	$ 27	$ 27
Additions Charged to Costs and Expense	46
Additions Charged to Other Accounts
Deductions	27	14
Balance at End of Year	$ 32	$ 13	$ 27