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Note 7 - Debt (Details Textual) - HSBC Bank [Member]
1 Months Ended
Aug. 05, 2011
USD ($)
Mar. 31, 2012
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate 1.75%      
Revolving Credit Facility [Member] | Prime Rate [Member]        
Debt Instrument, Basis Spread on Variable Rate (0.50%)      
Revolving Credit Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 7,000,000      
Five Year Term Loan [Member]        
Debt Instrument, Face Amount $ 2,100,000      
Loans Payable to Bank     $ 70,000 $ 280,000
HSBC Bank Mortgage Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate   1.75%    
HSBC Bank Mortgage Loan [Member]        
Debt Instrument, Face Amount   $ 6,000,000    
Debt Instrument, Number of Payments   120    
Debt Instrument, Periodic Payment   $ 25,000    
Debt Instrument, Interest Rate, Effective Percentage     2.174% 2.067%
Long-term Debt     $ 3,400,000 $ 3,600,000