Note 2 - Summary of Significant Accounting Policies - Revisions of Previously Issued (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020
Net Borrowing on lines of credit
Borrowings under line of credit	15,715	14,868	35,298	28,791	58,045	45,150	$ 77,200	61,398
Repayments under line of credit	(12,069)	(13,082)	(33,205)	(29,583)	(53,510)	(41,941)	(75,451)	(60,932)
Income taxes paid	550		1,338		1,822		$ 2,219	1,292
Previously Reported [Member]
Net Borrowing on lines of credit	3,646	1,786	2,093	(792)	4,535	3,209		466
Borrowings under line of credit
Repayments under line of credit
Income taxes paid	44		238		275			184
Revision of Prior Period, Adjustment [Member]
Net Borrowing on lines of credit	(3,646)	(1,786)	(2,093)	792	(4,535)	(3,209)		(466)
Borrowings under line of credit	15,715	14,868	35,298	28,791	58,045	45,150		61,398
Repayments under line of credit	(12,069)	$ (13,082)	(33,205)	$ (29,583)	(53,510)	$ (41,941)		(60,932)
Income taxes paid	$ 506		$ 1,100		$ 1,547			$ 1,108