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Note 8 - Notes Payable (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 24, 2013
Revolving Credit Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 5,000,000 $ 5,000,000    
Long-term Line of Credit 0 0    
Line of Credit Facility, Commitment Fee Amount $ 25,000 25,000    
Line of Credit Facility, Commitment Fee Percentage 0.50%      
Senior Credit Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity       $ 5,000,000
Deferred Finance Costs, Gross $ 2,700,000      
GE Capital 3rd [Member]        
Amortization of Financing Costs 880,000 936,000    
Amortization of Financing Costs $ 880,000 $ 936,000 $ 1,071,000