Note 13 - Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	[1]	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net income	$ 2,988	$ 3,921	$ 2,781	$ 2,376	$ 4,586	$ 6,122	$ 3,817		$ 2,450	$ 12,066	$ 16,975	$ 15,022
Weighted average shares outstanding - basic (in shares)	14,952,963	14,947,552	14,952,802	14,927,341	14,962,603	15,010,660	14,956,221		14,821,659	14,945,165	14,937,786	14,510,156
Dilutive common stock equivalents (in shares)										321,243	534,347	608,612
Weighted average number of shares outstanding during the period, diluted (in shares)	15,248,770	15,266,850	15,287,357	15,262,654	15,371,606	15,499,894	15,559,404		15,457,629	15,266,408	15,472,133	15,118,768
Basic (in dollars per share)	$ 0.20	$ 0.26	$ 0.19	$ 0.16	$ 0.31	$ 0.41	$ 0.26		$ 0.17	$ 0.81	$ 1.14	$ 1.04
Diluted (in dollars per share)	$ 0.20	$ 0.26	$ 0.18	$ 0.16	$ 0.30	$ 0.39	$ 0.25		$ 0.16	$ 0.79	$ 1.10	$ 0.99

[1] On May 2, 2018, the Company acquired CID, which manufactures medical uniforms, lab coats, and layers, and sells its products to specialty uniform retailers, ecommerce medical uniform retailers, and other retailers. For further details relating to this acquisition, refer to Note 18.