Note 4 - Shareholders' Equity and Preferred Stock (Details Textual) - USD ($)		12 Months Ended
	Dec. 27, 2019	Dec. 31, 2019	Dec. 31, 2018	Nov. 14, 2019	Nov. 26, 2014
Stock Repurchased and Retired During Period, Shares		357,461	281,787
Stock Repurchased and Retired During Period, Value		$ 2,517,000	$ 723,000
Own-share Lending Arrangement, Shares, Outstanding		1,459,233	1,459,233
Class B Preferred Units [Member]
Preferred Units, Issued				50,500,000
Preferred Unit Purchase Price				$ 1
Preferred Units Issued, Percentage of Preferred Return				16.00%
Preferred Units Issued, Maximum Percentage Points of Preferred Return in Form of Issuance of Additional Units or Cash				6.00%
Preferred Units, Authorized				50,500,000
Series A Preferred Stock [Member]
Temporary Equity, Shares Issued	400,000	400,000	0
Temporary Equity, Shares Authorized	10,000,000	10,000,000	0
Temporary Equity, Shares Outstanding	400,000	400,000	0
Temporary Equity, Liquidation Preference	$ 40,000,000
Preferred Stock, Dividend Rate, Percentage	6.00%
Temporary Equity, Redemption Price Per Share	$ 100
Temporary Equity, Conversion Price Per Share	$ 10
Dove Ventures, LLC [Member] | Senior Secured Term Loan Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity					$ 40,000,000
Extinguishment of Debt, Amount	$ 40,000,000