Note 9 - Stockholders' Equity (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jul. 31, 2012
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total	43,000
Discontinued Operation, Share-based Compensation		$ 391,000
Privately Negotiated Transaction [Member] | Common Stock [Member]
Stock Repurchased During Period, Shares	0	174,565
Stock Repurchase Program, Authorized Amount			$ 5,000,000
Stock Repurchased During Period, Value		$ 103,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 2,800,000
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	225,000	278,000
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total		0
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		43,000
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total		0
Stock Repurchased During Period, Shares	0