Note 14 - Equity - Changes in Stockholders' Equity (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Balances	$ 162,093,460	$ 167,736,796	$ 170,160,042	$ 174,314,407
Net (loss)/income	$ (2,875,476)	2,037,062	$ (3,793,733)	1,676,012
Repurchase of common stock (including excise tax) (in shares)	(600,000)		(1,700,000)
Repurchase of common stock (including excise tax)	$ (3,515,456)	(3,576,922)	$ (11,072,511)	(10,149,704)
Issuance of common stock upon vesting of RSUs	0	0	0	0
Payment of common stock tendered for employee stock-based compensation tax obligations	(214,794)		(214,794)	(12,533)
Cash dividend ($0.45 per share)	(32,135,118)	(32,944,314)	(32,135,118)	(32,944,314)
Stock-based compensation	721,440	395,454	1,130,170	764,208
Issuance of common stock upon exercise of warrants		6,120,778		6,120,778
Cash dividend ($0.45 per share)	32,135,118	32,944,314	32,135,118	32,944,314
Balances	$ 124,074,056	$ 139,768,854	$ 124,074,056	$ 139,768,854
Common Stock [Member]
Balances (in shares)	71,535,268	72,566,367	72,675,190	73,543,602
Balances	$ 7,154	$ 7,256	$ 7,268	$ 7,354
Net (loss)/income	$ 0	$ 0	$ 0	$ 0
Repurchase of common stock (including excise tax) (in shares)	(596,900)	(494,979)	(1,736,822)	(1,474,781)
Repurchase of common stock (including excise tax)	$ (60)	$ (49)	$ (174)	$ (147)
Issuance of common stock upon vesting of RSUs (in shares)	144,576	127,856	144,576	132,396
Issuance of common stock upon vesting of RSUs	$ 15	$ 13	$ 15	$ 13
Payment of common stock tendered for employee stock-based compensation tax obligations	0		0	0
Cash dividend ($0.45 per share)	0	0	0	0
Stock-based compensation	0	$ 0	0	$ 0
Issuance of common stock upon exercise of warrants (in shares)		824,903		824,903
Issuance of common stock upon exercise of warrants		$ 82		$ 82
Cash dividend ($0.45 per share)	$ (0)	$ (0)	$ (0)	$ (0)
Payment of common stock tendered for employee stock-based compensation tax obligations (in shares)				(1,973)
Balances (in shares)	71,082,944	73,024,147	71,082,944	73,024,147
Balances	$ 7,109	$ 7,302	$ 7,109	$ 7,302
Additional Paid-in Capital [Member]
Balances	234,366,497	226,426,529	233,957,767	226,070,308
Net (loss)/income	0	0	0	0
Repurchase of common stock (including excise tax)	0	0	0	0
Issuance of common stock upon vesting of RSUs	(15)	(13)	(15)	(13)
Payment of common stock tendered for employee stock-based compensation tax obligations	(214,794)		(214,794)	(12,533)
Cash dividend ($0.45 per share)	0	0	0	0
Stock-based compensation	721,440	395,454	1,130,170	764,208
Issuance of common stock upon exercise of warrants		6,120,696		6,120,696
Cash dividend ($0.45 per share)	(0)	(0)	(0)	(0)
Balances	234,873,128	232,942,666	234,873,128	232,942,666
Retained Earnings [Member]
Balances	(72,280,191)	(58,696,989)	(63,804,993)	(51,763,255)
Net (loss)/income	(2,875,476)	2,037,062	(3,793,733)	1,676,012
Repurchase of common stock (including excise tax)	(3,515,396)	(3,576,873)	(11,072,337)	(10,149,557)
Issuance of common stock upon vesting of RSUs	0	0	0	0
Payment of common stock tendered for employee stock-based compensation tax obligations	0		0	0
Cash dividend ($0.45 per share)	(32,135,118)	(32,944,314)	(32,135,118)	(32,944,314)
Stock-based compensation	0	0	0	0
Issuance of common stock upon exercise of warrants		0		0
Cash dividend ($0.45 per share)	32,135,118	32,944,314	32,135,118	32,944,314
Balances	(110,806,181)	(93,181,114)	(110,806,181)	(93,181,114)
AOCI Attributable to Parent [Member]
Balances	0	0	0	0
Net (loss)/income	0	0	0	0
Repurchase of common stock (including excise tax)	0	0	0	0
Issuance of common stock upon vesting of RSUs	0	0	0	0
Payment of common stock tendered for employee stock-based compensation tax obligations	0		0	0
Cash dividend ($0.45 per share)	0	0	0	0
Stock-based compensation	0	0	0	0
Issuance of common stock upon exercise of warrants		0		0
Cash dividend ($0.45 per share)	(0)	(0)	(0)	(0)
Balances	$ 0	$ 0	$ 0	$ 0