Note 13 - Earnings Per Share - Reconciliation of Basic and Diluted Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Net income attributable to Intelligent Systems Corporation	$ 10,969	$ 6,244
Weighted average common shares outstanding (in shares)	8,873,071	8,796,321
Earnings per share (in dollars per share)	$ 1.24	$ 0.71
Net income attributable to Intelligent Systems Corporation	$ 10,969	$ 6,244
Effect of dilutive potential common shares: stock options (in shares)	95,000	152,000
Total (in shares)	8,967,901	8,948,518
Earnings per share (in dollars per share)	$ 1.22	$ 0.70