Note 12 - Related Party Transaction (Details Textual) | Mar. 24, 2017USD ($)shares | Mar. 15, 2017USD ($)$ / sharesshares | Mar. 09, 2017USD ($) | Mar. 03, 2017USD ($)$ / sharesshares | Dec. 29, 2016USD ($) | Oct. 26, 2016USD ($)shares | Oct. 24, 2016USD ($) | Oct. 21, 2016USD ($)$ / shares | Mar. 31, 2017USD ($)shares | Mar. 31, 2017USD ($)shares | Dec. 31, 2016USD ($)shares | Mar. 20, 2017USD ($)shares | Feb. 28, 2017USD ($) | Feb. 22, 2017USD ($) |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | | | | 6.00% | |
Debt Instrument, Face Amount | | | | | | | | | | | | | | $ 400,000 | |
Proceeds from Convertible Debt | | | | | | | | | $ 500,000 | | | | | | |
Debt Instrument, Convertible, Conversion Price | $ / shares | | | | | | | | | $ 0.55 | | | | | | |
Interest Expense, Debt | | | | | | | | | | | $ 44,000 | | | | |
Stock Issued During Period, Shares, New Issues | shares | | | 500,000 | | | | | | | | | | | | |
Sale of Stock, Price Per Share | $ / shares | | | $ 0.60 | | | | | | | | | | | | |
Proceeds from Issuance of Common Stock | | | $ 300,000 | | | | | | | | | | | | |
Notes Payable, Related Parties, Current | | | | | | | | | | $ 250,000 | $ 250,000 | $ 250,000 | | | |
MCKEA Short-term Loan [Member] | | | | | | | | | | | | | | | |
Proceeds from Short-term Debt | | | | | | $ 250,000 | | | | | | | | | |
Cancellation of Short-term Borrowings | | $ 250,000 | | | | | | | | | | | | | |
Convertible Debt [Member] | | | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | 12.00% | 12.00% | 12.00% | 12.00% | | | |
Debt Instrument, Face Amount | | | | | | | | | $ 530,000 | | | | | | |
Interest Expense, Debt | | | | | | | | | | | $ 16,000 | | | | |
The Consultant Mr. Ault [Member] | | | | | | | | | | | | | | | |
Compensation | | | | | | | | | | | $ 45,000 | | | | |
MLSE Plasma-Laser System [Member] | | | | | | | | | | | | | | | |
Long-term Purchase Commitment, Period | | | | | | | | | | 3 years | | | | | |
Long-term Purchase Commitment, Amount | | | | | | | | | | $ 50,000,000 | | | | | |
Avalanche International Corp. [Member] | | | | | | | | | | | | | | | |
Weighted Average Number of Shares Outstanding, Diluted | shares | | | | | 52,128,325 | | | | | | | | | | |
JLA Realty [Member] | Digital Power Corporation [Member] | | | | | | | | | | | | | | | |
Equity Method Investment, Shares Owned | shares | | | | | | | | | | | | | 666,667 | | |
Equity Method Investment, Ownership Percentage | | | | | | | | | | | | | 7.50% | | |
Series B Preferred Stock [Member] | MCKEA Short-term Loan [Member] | | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, New Issues | shares | | 25,000 | | | | | | | | | | | | | |
Avalanche International Corp. [Member] | | | | | | | | | | | | | | | |
Available-for-sale Securities, Equity Securities, Number of Shares | shares | | | | | | | | | | 17,080 | 17,080 | 250,900 | | | |
Available-for-sale Securities, Equity Securities | | | | | | | | | | $ 7,000 | $ 7,000 | $ 85,000 | | | |
Avalanche International Corp. [Member] | | | | | | | | | | | | | | | |
Financing Receivable, State Interest Rate | | | | | | | | | | 12.00% | 12.00% | | | | |
Financing Receivable, Gross | | | | | | | | | | $ 525,000 | $ 525,000 | | | | $ 1,500,000 |
Financing Receivable, Conversion Ratio | | | | | | | | | | 0.74536 | 0.74536 | | | | |
Financing Receivable, Convertible Feature, Number of Shares Issuable | shares | | | | | | | | | | 2,113,086 | 2,113,086 | | | | |
Debt Instrument, Convertible, Conversion Ratio | | | | | 0.5 | | | | | | | | | | |
Stock Options, Number of Shares Called by Options | shares | | | | | 531,919 | | | | | | | | | | |
Avalanche International Corp. [Member] | Series B Preferred Stock [Member] | | | | | | | | | | | | | | | |
Convertible Preferred Stock, Conversion Price | $ / shares | | | | | $ 0.50 | | | | | | | | | | |
Avalanche International Corp. [Member] | Subsequent Event [Member] | | | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | 7.00% | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | $ 9,500,000 | | | | | | | | | | |
Avalanche International Corp. [Member] | MTIX [Member] | | | | | | | | | | | | | | | |
Payments to Acquire Businesses, Gross | | | | | | | $ 50,000 | $ 50,000 | | | | | | | |
Avalanche International Corp. [Member] | MTIX [Member] | Series B Preferred Stock [Member] | | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, Acquisitions | shares | | | | | | | 100,000 | | | | | | | | |
Avalanche International Corp. [Member] | MTIX [Member] | Subsequent Event [Member] | | | | | | | | | | | | | | | |
Payments to Acquire Businesses, Gross | | | | | $ 500,000 | | | | | | | | | | |
Avalanche International Corp. [Member] | Excess Funding of Note Receivable [Member] | | | | | | | | | | | | | | | |
Financing Receivable, State Interest Rate | | | | | | | | | | 12.00% | 12.00% | | | | |
Financing Receivable, Gross | | | | | | | | | | $ 52,000 | $ 52,000 | | | | |
Financing Receivable, Discount Rate | | | | | | | | | | 5.00% | 5.00% | | | | |
Avalanche International Corp. [Member] | Notes Receivable [Member] | | | | | | | | | | | | | | | |
Financing Receivable, State Interest Rate | | | | | | | | | | 12.00% | 12.00% | | | | |
Financing Receivable, Conversion Ratio | | | | | | | | | | 0.74536 | 0.74536 | | | | |
Financing Receivable, Convertible Feature, Number of Shares Issuable | shares | | | | | | | | | | 2,113,086 | 2,113,086 | | | | |
Financing Receivable, Discount Rate | | | | | | | | | | 5.00% | 5.00% | | | | |
Payments to Acquire Notes Receivable | | | | | | | | | | | $ 603,000 | 950,000 | | | |
Philou [Member] | Series B Preferred Stock [Member] | | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, New Issues | shares | | 25,000 | | | | | | | | | | | | | |
Philou [Member] | Series B Preferred Stock [Member] | Preferred Stock Purchase Agreement [Member] | | | | | | | | | | | | | | | |
Stock Purchase Agreement, Maximum Investment | | | | $ 5,000,000 | | | | | | | | | | | |
Stock Purchase Agreement, Term | | | | 3 years | | | | | | | | | | | |
JLA Realty [Member] | | | | | | | | | | | | | | | |
Notes Payable, Related Parties, Current | [1] | | | | | | | | | $ 250,000 | $ 250,000 | | | | |
JLA Realty [Member] | Notes Payable, Other Payables [Member] | | | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | | | 6.00% | | |
Notes Payable, Related Parties, Current | | | | | | | | | | | | | $ 250,000 | | |
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[1] | On March 20, 2017, the Company entered into an agreement with JLA Realty Associates, LLC ("JLA Realty") for a demand promissory note (the "JLA Note") in the amount of $250 accruing interest at the rate of 6% per annum on unpaid principal. JLA Realty owns 666,667 shares of the Company's common stock and therefore a greater than 5% beneficial owner of the Company. The JLA Note may be prepaid, in whole or in part, without penalty, at the option of the Company and without the consent of JLA. As of March 31, 2017, no interest was accrued on the JLA Note. | |