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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