Note 14 - Stock Repurchase Plans (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended		45 Months Ended	62 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Jul. 31, 2019	Dec. 31, 2020
Stock Repurchase Program, Authorized Amount				$ 3,000
Stock Repurchased and Retired During Period, Shares (in shares)	13,767			297,020	243,075
Stock Repurchased and Retired During Period, Value	$ 74	$ 74	$ 1,142	$ 1,195	$ 1,216
Payments for Stock Repurchased Broker Fees					$ 6