Note 5 - Bank Debt - Bank Debt, Less Debt Issuance Costs (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current bank debt	$ 36,750	$ 36,750
Less unamortized debt issuance costs	(2,439)	(2,439)
Net current portion	34,311	34,311
Long-term bank debt	99,300	100,988
Less unamortized debt issuance costs	(3,070)	(3,681)
Net long-term portion	96,230	97,307
Total bank debt	136,050	137,738
Less total unamortized debt issuance costs	(5,509)	(6,120)
Net bank debt	$ 130,541	$ 131,618