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Note 1 - Principal Business Activity and Summary of Significant Account Policies (Details Textual) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 shares | Jun. 30, 2014 USD ($)
Reclassification of Deferred Tax Assets from Current to Noncurrent [Member] | December 31, 2014 [Member] |  |  |  |
Deferred Tax Assets, Gross, Current | $ 1,708,000 |  |  |
Deferred Tax Liabilities, Net, Current | 128,000 |  |  |
Deferred Tax Liabilities, Net, Noncurrent | 622,000 |  |  |
Deferred Tax Assets, Net, Noncurrent | 3,591,000 |  |  |
Interest Rate Swap [Member] | Other Noncurrent Liabilities [Member] |  |  |  |
Derivative Liability | $ 4,453 | $ 14,716 |  |
Weighted Average Number Diluted Shares Outstanding Adjustment | shares | 85,000 | 0 | 381,919 |
Loss Contingency, Estimate of Possible Loss, Percentage |  |  |  | 41.00%
Loss Contingency, Estimate of Possible Loss |  |  |  | $ 44,700,000
Loss Contingency, Estimate of Change in Cost of Sales |  |  |  | $ 2,600,000
Number of Financial Institutions with which Cash is Maintained | 2 |  |  |
Cash, Uninsured Amount | $ 1,103,000 | $ 1,110,000 |  |
Deferred Gain (Loss) on Derivative, Net | 4,500 | 14,700 |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | 3,453 | 9,716 |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax Effect | $ 1,000 | $ 5,000 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares | 184,983 |  | 116,292 |
Unrecognized Tax Benefits | $ 98,000 |  |  |

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