Note 15 - Earnings Per Share - Reconciliation of Basic and Diluted Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net income attributable to Intelligent Systems Corporation	$ 6,244	$ 374
Weighted average common shares outstanding (in shares)	8,796,321	8,766,425
Earnings per share (in dollars per share)	$ 0.71	$ 0.04
Net income (loss) attributable to Intelligent Systems Corporation	$ 6,244	$ 374
Effect of dilutive potential common shares: stock options (in shares)	152,000	116,000
Total (in shares)	8,948,518	8,881,814
Earnings per share (in dollars per share)	$ 0.70	$ 0.04