Note 7 - Stockholders' Equity - Reconciliation of Activity in Stockholders' Equity Accounts (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Balance			$ 13,644				$ 13,644
Net income (loss)	$ (59)			$ 1,493			405	$ (1,562)
Settlement of employee benefit obligations directly related to the disposal transaction								2,422
Balance	14,113						14,113
Common Stock [Member]
Balance	294	$ 294	294	294	$ 295	$ 298	294	298
Net income (loss)
Stock-based compensation expense
Settlement of employee benefit obligations directly related to the disposal transaction
Stock repurchase					(1)	(3)
Dividends
Balance	294	294	294	294	294	295	294	294
Additional Paid-in Capital [Member]
Balance	17,328	17,306	17,285	17,241	17,253	17,104	17,285	17,104
Net income (loss)
Stock-based compensation expense	21	22	21	22	14	391
Settlement of employee benefit obligations directly related to the disposal transaction
Stock repurchase					(29)	(100)
Dividends						(139)
Balance	17,349	17,328	17,306	17,263	17,241	17,253	17,349	17,263
Retained Earnings [Member]
Balance	(3,471)	(2,569)	(3,935)	(5,549)	(5,862)	(2,495)	(3,935)	(2,495)
Net income (loss)	(59)	(902)	1,366	1,492	313	(3,367)
Stock-based compensation expense
Settlement of employee benefit obligations directly related to the disposal transaction
Stock repurchase
Dividends
Balance	(3,530)	(3,471)	(2,569)	(4,057)	(5,549)	(5,862)	(3,530)	(4,057)
AOCI Attributable to Parent [Member]
Balance						(2,422)		(2,422)
Net income (loss)
Stock-based compensation expense
Settlement of employee benefit obligations directly related to the disposal transaction						2,422
Stock repurchase
Dividends
Balance