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Note 2 - Notes Payable and Long-term Debt (Details Textual)
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 18, 2015
USD ($)
shares
Apr. 30, 2008
Jul. 31, 2007
USD ($)
a
ft²
Sep. 30, 2015
USD ($)
Mar. 31, 2016
Jun. 30, 2016
USD ($)
shares
Jun. 30, 2015
USD ($)
Dec. 31, 2015
Jun. 23, 2014
USD ($)
Jul. 12, 2012
USD ($)
Promissory Note and Business Loan Agreement with BOKF [Member] | Maximum [Member]                    
Debt Instrument, Covenants, Debt to EBITDA Ratio 1.5                  
Promissory Note and Business Loan Agreement with BOKF [Member] | Minimum [Member]                    
Debt Instrument, Covenants, Fixed Charge Coverage Ratio 1.2                  
Promissory Note and Business Loan Agreement with BOKF [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity $ 6,000,000                  
Debt Instrument, Term 2 years                  
Promissory Note with BOKF [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity $ 10,000,000                  
Line of Credit Facility, Maximum Shares to Be Purchased by Borrowing | shares 1,200,000                  
Line of Credit Facility, Term of the Term Note into which the Principal Balance Will Be Rolled 4 years                  
Proceeds from Issuance of Long-term Debt           $ 3,700,000        
Treasury Stock, Shares, Acquired | shares           520,500        
Line of Credit Facility, Remaining Borrowing Capacity           $ 2,600,000        
Two Promissory Notes with BOKF [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument, Basis Spread on Variable Rate         1.85%          
Two Promissory Notes with BOKF [Member]                    
Debt Instrument, Interest Rate, Effective Percentage           2.298%   2.263%    
Credit Agreement with JPMorgan Chase Bank, N.A. [Member] | Building [Member]                    
Area of Real Estate Property | ft²     191,000              
Credit Agreement with JPMorgan Chase Bank, N.A. [Member] | Land [Member]                    
Area of Real Estate Property | a     30              
Credit Agreement with JPMorgan Chase Bank, N.A. [Member] | Term Note [Member] | Interest Expense [Member]                    
Debt Instrument, Prepayment Penalty       $ 200,000            
Credit Agreement with JPMorgan Chase Bank, N.A. [Member] | Term Note [Member]                    
Debt Instrument, Term   10 years                
Debt Instrument, Interest Rate, Stated Percentage   7.10%                
Credit Agreement with JPMorgan Chase Bank, N.A. [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity     $ 5,500,000              
Proceeds from Bank Debt     $ 4,050,000              
Line of Credit Note with JPMorgan Chase Bank, N.A.[Member]                    
Line of Credit Facility, Maximum Borrowing Capacity                 $ 6,000,000 $ 4,000,000
Proceeds from Issuance of Long-term Debt           $ 3,660,505