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Note 7 - Loan Payable to Officer (Details Textual) - USD ($)
9 Months Ended
Sep. 30, 2016
Feb. 09, 2017
Dec. 31, 2016
Feb. 04, 2016
Dec. 31, 2015
Interest Payable, Current     $ 184,000   $ 76,000
Revolving Credit Facility [Member] | Chief Executive Officer [Member]          
Line of Credit Facility, Maximum Borrowing Capacity $ 2,700,000     $ 2,200,000  
Line of Credit Facility, Interest Rate at Period End 5.00%        
Long-term Line of Credit     2,885,000    
Interest Payable, Current     $ 184,000    
Revolving Credit Facility [Member] | Chief Executive Officer [Member] | Prime Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate 1.00%        
Revolving Credit Facility [Member] | Chief Executive Officer [Member] | Subsequent Event [Member]          
Line of Credit Facility, Maximum Borrowing Capacity   $ 3,400,000