Note 7 - Intangible Assets (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years 182 days
Amortization of Intangible Assets	$ 176,000	$ 197,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	96,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	96,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	96,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four	96,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 96,000