Note 7 - Stockholders' Equity (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Jul. 31, 2012
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total
Discontinued Operation, Share-based Compensation			$ 391,000
Allocated Share-based Compensation Expense, Total			14,000
Discontinued Operations, Dividends			$ 139,000
Privately Negotiated Transaction [Member] | Common Stock [Member]
Stock Repurchased During Period, Shares	46,556	0	221,121	0
Stock Repurchase Program, Authorized Amount					$ 5,000,000
Stock Repurchased During Period, Value	$ 30,000		$ 133,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 2,800,000		$ 2,800,000
Employee Stock Option [Member]
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total	0	0	0	0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			63,000	993,000
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			205,000	462,000
Stock Repurchased During Period, Shares	0