Note 7 - Long-Term Debt and Revolving Line of Credit (Details Textual) | 1 Months Ended | 9 Months Ended | 12 Months Ended | | | |
Oct. 31, 2017USD ($) | Jun. 30, 2017USD ($) | Jun. 30, 2015USD ($) | Sep. 30, 2017USD ($)shares | Sep. 30, 2016shares | Dec. 31, 2016USD ($) | Jan. 31, 2017USD ($) | Dec. 31, 2015USD ($) | Apr. 30, 2015USD ($) |
Secured Debt | | | $ 47,300,000 | $ 169,425,000 | | $ 140,717,000 | | | |
Line of Credit Facility, Accordion Feature | | | 50,000,000 | | | | | | |
Long-term Debt, Weighted Average Interest Rate | | | | 5.19% | | | | | |
Debt Instrument Covenant, Fixed Charge Coverage Ratio | | | | (1.4) | | | | | |
Debt Instrument, Leverage Ratio | | | | 10.9 | | | | | |
Debt Instrument Minimum Leverage Ratio For Dividend Distribution | | | | 4.0:1.0 | | | | | |
Line of Credit Facility, Remaining Borrowing Capacity | | | | $ 5,600,000 | | | | | |
Stock Option With Marketbased Vesting [Member] | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period | shares | | | | 1,875 | 20,550 | | | | |
Minimum [Member] | | | | | | | | | |
Delayed Draw Term Loan, Maximum Borrowing Capacity | | | 40,000,000 | | | | | | |
Debt Instrument Covenant, Fixed Charge Coverage Ratio | | | | 1.05 | | | | | |
Debt Instrument, Leverage Ratio | | | | 1 | | | | | |
Minimum [Member] | Debt Instrument Leverage Ratio on September 30, 2017 [Member] | | | | | | | | | |
Debt Instrument Covenant, Fixed Charge Coverage Ratio | | | | 1 | | | | | |
Minimum [Member] | Debt Instrument Leverage Ratio on December 31, 2017 [Member] | | | | | | | | | |
Debt Instrument Covenant, Fixed Charge Coverage Ratio | | | | 1 | | | | | |
Minimum [Member] | Debt Instrument Leverage Ratio On March 31 , 2018 [Member] | | | | | | | | | |
Debt Instrument Covenant, Fixed Charge Coverage Ratio | | | | 1 | | | | | |
Minimum [Member] | Debt Instrument Fixed Charge Coverage Ratio for December 31, 2017 and Thereafter [Member] | | | | | | | | | |
Debt Instrument Covenant, Fixed Charge Coverage Ratio | | | | 1.2 | | | | | |
Minimum [Member] | Debt Instrument Fixed Charge Coverage Ratio For September 30 2017 [Member] | | | | | | | | | |
Debt Instrument Covenant, Fixed Charge Coverage Ratio | | | | 1.05 | | | | | |
Minimum [Member] | EBITDA for October 31 2017 [Member] | | | | | | | | | |
Earnings before Interest Tax Depreciation and Amortization | | | | $ 4,000,000 | | | | | |
Minimum [Member] | EBITDA for November 30 2017 [Member] | | | | | | | | | |
Earnings before Interest Tax Depreciation and Amortization | | | | 4,800,000 | | | | | |
Minimum [Member] | EBITDA for December 31 2017 [Member] | | | | | | | | | |
Earnings before Interest Tax Depreciation and Amortization | | | | $ 5,000,000 | | | | | |
Maximum [Member] | | | | | | | | | |
Delayed Draw Term Loan, Maximum Borrowing Capacity | | | 115,000,000 | | | | | | |
Debt Instrument, Leverage Ratio | | | | 5.5 | | | | | |
Maximum [Member] | Debt Instrument Leverage Ratio on September 30, 2017 [Member] | | | | | | | | | |
Debt Instrument Covenant, Fixed Charge Coverage Ratio | | | | 5.5 | | | | | |
Maximum [Member] | Debt Instrument Leverage Ratio on December 31, 2017 [Member] | | | | | | | | | |
Debt Instrument Covenant, Fixed Charge Coverage Ratio | | | | 4.5 | | | | | |
Maximum [Member] | Debt Instrument Leverage Ratio on March 31, 2018 and Thereafter [Member] | | | | | | | | | |
Debt Instrument Covenant, Fixed Charge Coverage Ratio | | | | 3.5 | | | | | |
Revolving Credit Facility [Member] | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | 25,000,000 | $ 25,000,000 | | | | | |
Line of Credit Facility, Current Borrowing Capacity | | | | 22,400,000 | | | | | |
Revolving Credit Facility [Member] | Eligible Account Receivable [Member] | | | | | | | | | |
Line of Credit Facility, Current Borrowing Capacity | | | | 12,400,000 | | | | | |
Revolving Credit Facility [Member] | Eligible Inventory [Member] | | | | | | | | | |
Line of Credit Facility, Current Borrowing Capacity | | | | $ 10,000,000 | | | | | |
Revolving Credit Facility due June 2019 [Member] | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | 20,000,000 | | | | | | |
Term Loan Due June 25, 2020 [Member] | | | | | | | | | |
Debt Instrument, Term | | | | 5 years | | | | | |
Debt Instrument, Face Amount | | | | $ 47,300,000 | | | | | |
Secured Debt | | | | 39,600,000 | | 42,600,000 | | | |
Term Loan Due June 25, 2020 [Member] | Payment Date First Year [Member] | | | | | | | | | |
Debt Instrument, Periodic Payment, Principal | | $ 675,000 | | 675,000 | | 675,000 | | | |
Term Loan Due June 25, 2020 [Member] | Payment Date Thereafter [Member] | | | | | | | | | |
Debt Instrument, Periodic Payment, Principal | | $ 1,000,000 | | 1,000,000 | | 1,000,000 | | | |
Delayed Draw Term Loan Due June 2020 [Member] | | | | | | | | | |
Delayed Draw Term Loan, Maximum Borrowing Capacity | | | $ 115,000,000 | | | | $ 108,500,000 | $ 99,600,000 | $ 40,000,000 |
Debt Instrument, Draw Period | | | 2 years | | | | | | |
Debt Instrument, Percent of Outstanding Balance Payable | | | 1.50% | | | | | | |
Secured Debt | | | | 104,937,000 | | 72,342,000 | | | |
Delayed Draw Term Loan Due June 2020 [Member] | Subsequent Event [Member] | | | | | | | | | |
Proceeds from Lines of Credit | $ 108,500,000 | | | | | | | | |
Term Loan Due June 2020 [Member] | | | | | | | | | |
Secured Debt | | | $ 27,300,000 | | | | | | |
Term Loan Due December 29, 2022 [Member] | | | | | | | | | |
Debt Instrument, Face Amount | | | | 11,100,000 | | | | | |
Secured Debt | | | | $ 10,162,000 | | 10,577,000 | | | |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate | | | | 4.40% | | | | | |
Debt Instrument, Periodic Payment | | | | $ 255,006 | | $ 255,006 | | | |