Note 8 - Purchase of Equity Securities (Details Textual) - shares		6 Months Ended	12 Months Ended
	Dec. 27, 2016	Jun. 30, 2016	Dec. 31, 2015
Scenario, Forecast [Member] | Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	10
Scenario, Forecast [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	2
Scenario, Forecast [Member] | Employees [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	400,000
Scenario, Forecast [Member] | Employees [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	500,000
Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	589,488
Executives and Directors [Member]
Treasury Stock, Shares, Acquired		0	0