Note 5 - Income (Loss) Per Common Share (Details Textual) - shares	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total (in shares)	2,960,950	2,923,515
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants (in shares)	1,635,675	1,591,935
Incremental Common Shares Attributable to Dilutive Effect of Deferred Shares (in shares)	2,134,009	2,134,009