Note 6 - Long-term Debt - Long-term Debt (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Long-term debt, gross	$ 42,183,000	$ 23,950,000
Payments due within one year included in current liabilities	5,893,000	2,750,000
Debt issuance costs	63,000	69,000
Long-term debt less current maturities	36,227,000	21,131,000
Term Loan [Member]
Long-term debt, gross	39,643,000
Note Payable, Maturing March 8, 2021 [Member]
Long-term debt, gross	2,540,000	2,200,000
Term Loan, Paid March 8, 2016 [Member}
Long-term debt, gross		$ 21,750,000