Note 9 - Stock Split Disclosure - Effect of Stock Split (Details) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Restated net income per common share - basic (in dollars per share)	$ 0.16	$ 0.46
Restated net income per common share - diluted (in dollars per share)	$ 0.16	$ 0.46
Restated weighted-average common shares issued (in shares)	7,298,740	7,270,608
Restated average treasury stock shares (in shares)	881,631	772,330
Restated average shares outstanding - basic (in shares)	6,417,109	6,498,278
Restated stock options and restricted stock (in shares)	12,334	12,290
Restated average shares outstanding - diluted (in shares)	6,429,443	6,510,568
Restated period ending shares outstanding (in shares)	6,369,467	6,512,740	6,423,630
Restated treasury shares outstanding (in shares)	929,362	772,330	871,162