Note 5 - Summary of Credit Agreement and Line of Credit Note (Details) (Parentheticals) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Promissory Note with BOKF [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Note, Interest at LIBOR	1.85%
Promissory Note with BOKF [Member]
Line of Credit Note, Principal Amount	$ 10,000,000
Promissory Note and Business Loan Agreement with BOKF [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Note, Interest at LIBOR	1.85%
Promissory Note and Business Loan Agreement with BOKF [Member]
Line of Credit Note, Principal Amount	$ 6,000,000
Credit Agreement with JPMorgan Chase Bank, N.A. [Member]
Line of Credit Note term		10 years
Line of Credit Note monthly principal payments		$ 16,875
Line of Credit Note interest		7.10%
Line of Credit Note with JPMorgan Chase Bank, N.A.[Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Note, Interest at LIBOR		2.00%
Line of Credit Note with JPMorgan Chase Bank, N.A.[Member]
Line of Credit Note, Principal Amount		$ 6,000,000
Line of Credit Note term