Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands	Mar. 31, 2022	Dec. 31, 2021
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	5,955,408	5,930,408
Common stock, shares outstanding (in shares)	5,911,750	5,886,750
Treasury stock, shares (in shares)	43,658	43,658
Series A Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	3,000,000	3,000,000
Preferred stock, shares issued (in shares)	500,000	500,000
Preferred stock, shares outstanding (in shares)	500,000	500,000
Preferred stock, liquidation preference	$ 5,000,000	$ 5,000,000
Series B Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	170,000	170,000
Preferred stock, shares issued (in shares)	170,000	170,000
Preferred stock, shares outstanding (in shares)	170,000	170,000
Preferred stock, liquidation preference	$ 1,700,000	$ 1,700,000
Series C Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	170,000	170,000
Preferred stock, shares issued (in shares)	170,000	170,000
Preferred stock, shares outstanding (in shares)	170,000	170,000
Preferred stock, liquidation preference	$ 1,700,000	$ 1,700,000
Series D Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	170,000	170,000
Preferred stock, shares issued (in shares)	170,000	170,000
Preferred stock, shares outstanding (in shares)	170,000	170,000
Preferred stock, liquidation preference	$ 1,700,000	$ 1,700,000