Note 10 - Long-term Debt - Long-term Debt Instruments (Details) (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Revolving Credit [Member]
Effective interest rate	3.90%	4.00%
Term Loan [Member]
Effective interest rate	3.80%	3.70%
Debt instrument, periodic payment, principal	$ 102	$ 102
Promissory Note Dated August 2, 2013 [Member]
Effective interest rate	2.99%	2.99%
Debt instrument, periodic payment, principal	$ 125	$ 125
Capital Lease Obligations [Member]
Effective interest rate	6.00%	6.00%